In a Police Procedural, interviews are short and sweet, and the characters try to give as little useful information as possible. This is done to keep as many of the characters as possible suspects for as long as possible, but often falls flat. In order to give an excuse for this unhelpful behavior, the characters that didn't do it often have a Big Secret. In cases of You Didn't Ask, they'll answer your questions and give you nothing more, dragging the whole thing out.
One need not be a suspect to be as unhelpful as possible. Almost never, in the entire history of television, has a victim's family been interested in finding the actual perp once a Red Herring suspect has been identified. If a suspect has been wrongly convicted, the family will occasionally go as far as to actively hinder the investigation, even when it is obvious that the real killer is still at large, preferring the "closure" of a conviction. This is one of the rare cases of a cop show mirroring real life.
This trope is sometimes inverted, rather than subverted. The guilty party has been providing information to clear his name, expressing support for the investigation at every opportunity, and generally being too helpful — all in an effort to deflect suspicion. (CSI: Crime Scene Investigation is fond of this variation, as is Scooby-Doo.) Another alternative is Infraction Distraction, where the guilty party confesses to minor wrongdoing to cover up major wrongdoing.
In Real Life, however, this is how smart people speak to police officers who are questioning them as suspects, no matter what. You do not lie, but you do keep in mind that nothing you say to a police officer can help your case (as noted on the Only Bad Guys Call Their Lawyers page). Unless you are absolutely, entirely certain that you are being spoken to as a witness or a victim, the only things you should say to a police officer are "How may I help you?" (establishing why the questioning is being done), and then "are you detaining/arresting me or am I free to go?" and if you are free to go, then leave - if not, demand a lawyer and shut the hell up, even (perhaps especially) if you know you are innocent.
See also Perp Sweating, Only Bad Guys Call Their Lawyers. Not to be confused with Stop Helping Me!.
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Anime & Manga
In Monster, Tenma averts this until Lunge, of all people, tells him to keep silent to hinder the investigation.
Rem in Death Note, when answering the questions L makes him about the Death Note.
System Restore: When Kuzuryuu realizes that Togami and Hinata suspect he might be involved in Pekoyama's murder, he reveals he has a good idea who the murderer is... but refuses to tell them, as he wants to bring down the culprit himself. As a result, the information he's withholding doesn't come out until the school trial, where he gives a lengthy and insulting summation revealing all he knows... only to learn his suspect has no idea what the hell he's talking about.
In Once Upon A Crime several of the main characters lie outrageously and try to create alibis for each other about the murder they're caught up in. It's a rare justified example because they're all innocent but due to several bizarre twists of fate (such as one of them stealing a suitcase that contains the body) they find themselves implicated, and fear that unless they have some kind of alibi, they'll be sentenced no matter how innocent they are.
In Bad Lieutenant Port Of Call New Orleans, the investigation of a quintuple murder is stymied by the fact that no one they interview wants to answer any questions. This has a much simpler justification than most examples of this trope: all of the interviewees know who committed the murders, and they're terrified of him.
A non-police version is seen in Winds of Fury. Mornelithe is under magical coercions, and isn't happy about it. He places his own set of coercions on his mind, forcing himself to follow this trope whenever Ancar asks him anything (Ancar simply uses his prior coercions to get information out of Mornelithe, but it was a good try.)
In the Horatio Hornblower books, Hornblower has this problem almost ever time he's in an involved military operation. You'd think, say, the Spanish, as their allies, would give the British Navy all possible assistance when trying to retake crucial military positions. Nope. He has this problem with other elements of the British Navy, too.
Live Action TV
When a member of CSI: Crime Scene Investigation indicates that the husband is always the first suspect when a wife is murdered, the husband's response is typically "You think I did this? This interview is over!" While common sense might dictate giving all the information to clear your name as quickly as possible, it's actually more pragmatic not to. In Real Life, police expect ordinary people to get angry when accused of crimes they didn't commit.
This is mentioned in The Lives of Others. At the beginning of the movie, a Stasi officer explains that if you question an innocent man for several hours, he will get seriously pissed off and start screaming at you. On the other hand, someone who's guilty will try to be helpful and cooperate, no matter how long the questioning.
And of course it depends on the quality of your police force. There is such a thing as police fabricating evidence. Obviously, the Stasi were among the less trustworthy (their allies the Soviet KGB actually had an entire division just for creating false documents to frame accused suspects).
The one exception to the statement that "victims' families lie" occurs in Life On Mars, where the parents of a murdered schoolgirl actually send ransom notes and threats to the police because they feel that by imprisoning the Red Herring and ignoring various pieces of evidence in order to close the case rapidly, the police were insulting the memory of their daughter. Of course, they are still as unhelpful as possible, since being helpful would make it obvious that they were blackmailing the police.
Befitting its reputation for being a Medical Procedural, House features patients who, even in the face of their impending nasty and painful deaths from various illnesses, will still lie to protect their pointless secrets. Usually happens for one of four explanations that keep popping up: a) the patient wants to keep a secret that would ruin him or her, b) the patient doesn't know the secret, c) the patient doesn't realize that the secret is connected to his illness, and the overriding d) the patient doesn't believe their life is in danger because, hey! They're in a hospital!
There are also cases where some immediate family member will be the one keeping the secret, usually for one of the same reasons above.
This was actually later lampshaded by a patient who remarks "You know what my favorite time to lie is? When my life's hanging in the balance."
It doesn't help that quite often the doctors perform their interview with the patient with their family, friends, or whoever they actually care about keeping the secret from right in the room. Even when they realize the patient probably has a secret, they only occasionally bother to try to talk the patient alone or assure them they will keep the secret. Asking people to reveal secrets is a lot easier if you provide some measure of confidentiality. You know, as doctors are legally bound to do. There are exceptions, but whatever the person is concealing rarely qualifies. Not that it stops these doctors from spilling the beans half the time anyway.
Lampshaded on Bones, where Booth points out to a film student suspect that this is the point where the innocent person helps, and the guilty person asks for their lawyer. The kid helps. At the end of the episode, they know they've got the right guy when they present him with evidence and he...asks for his lawyer. He's not actually telling the truth, just manipulating the student's Genre Savvy; on several occasions in the show, the innocent parties have called a lawyer, sometimes to protect some other secret not related to the case.
Played with on Bones again later, during the coma dream episode. Everybody believes Booth is the killer... and they're all being as difficult as possible to protect him. Of course, none of them believe him when he says he didn't do it, and they refuse to stop, even when he asks them to.
On one Law & Order: Special Victims Unit episode, a man is accusing three women of raping him. The ADA specifically asks him if there's anything else he'd like to tell her, and he looks uncertain for a second and says no. Turns out in court that he tried to sue his rapists, making him look like a golddigger. He was just trying to get information on them, but the ADA still rips him a new one. Of course, Cabot was holding something of an Idiot Ball herself; what type of ADA doesn't check the records of a star witness to find something the defense can use to discredit them?
In Breaking Bad, Hector Salamanca, an old cartel boss now almost completely paralyzed and only able to communicate via a bell on his wheelchair, makes a point of being as big an ass to the feds as possible when brought in for questioning. On the two occasions he was with the feds in the series, he intentionally soiled himself the first time, then with the help of a woman reading off the alphabet to him while hitting the bell for the correct letters to convey his messages, told them "SUCK MY" and "FUC".
The Shield uses the normal example straight many times, but also notably uses the Inverted example as well. Dutch Wagenbach and Steve Billings are investigating a serial child rapist, and Billings figures out that the child shelter manager who has been extremely helpful has been *too* helpful. Yup, turns out it was him.
Another Inverted example occurs when Dutch is investigating a routine shooting, and asks three suspects for gunshot residue tests to see if they've fired a weapon. Two of the suspects refuse, and the third agrees. Turns out, the third guy did it. He didn't refuse the test because, "Well, you said it was a government test, right? I figured...how accurate could it be?"
Actually, it was two suspects, and they both agreed to the test. The one not in the above quote was a cheapskate, and asks Dutch if the test will cost him anything. Dutch's response: "Only if you're lying."
Averted in NUMB3RS, when a rich father finds his Paris Hilton Captain Ersatz daughter has decided to go all Patty Hearst. He rushes into the station, takes one look at the TV paused on a shot of his daughter, and says he'll do anything he can to help the police. When the FBI Agent remarks that he's being remarkably helpful, he says that the sooner they get his daughter home safe, the sooner he can prepare a defense.
Thankfully averted during the serial killer storyline on Blue Heelers in 2005. When the (innocent) prime suspect, a psychiatrist, is talking to the detective socially, he realises midway through their conversation how much of the evidence points to him: he lives across the street from the first victim, he runs the support group for child sex abuse sufferers that victims 2 and 3 belonged to, he used to be a priest (tying in with the religious symbols next to the bodies), he has a criminal record for domestic violence and he has no alibi for any of the nights on which the murders occurred. He immediately chooses to make a statement, and, once cleared, helps them catch the killer.
Although not a crime show, LOST frequently maintains its mysterious mysteriousness with this trope. The characters repeatedly encounter people who have very useful information that is critical to their survival but refuse to share this information even when it would be a really, really good idea. These kinds of characters often make cryptic references which indicate they have a deeper knowledge of the situation, but the protagonists never bother to ask them direct questions.
Inverted in an episode of The Sentinel. Ellison is trying to track down a serial killer, and a profiler is brought in to tell them about the psychological make-up of the killer. It turns out near the end of the episode that the profiler was the serial killer. He had killed the real profiler and took his place, and provided them with completely accurate information about himself just to screw with them.
Try counting the number of times "No comment" is said in the interrogation room on UK crime drama The Bill.
Refreshingly averted in one episode of Castle, where the suspect (who they are absolutely certain is the killer) gives them absolutely everything they need, over the objections of his lawyer. "Save the defense for when I actually kill someone, all right?"
David Mitchell: What happened immediately after the foot-running-over moment?
David: Can you roll that forwards?
Lee: "Ow! That was my foot!"
Despite being played straight in practically every episode of Law & Order, the show also includes a couple of glorious subversions of the concept as well. One of the most notable involves an old woman on the neighborhood watch, who can't describe the suspect...but the next thing she says is that she took down his license plate number. The detectives, nearly at wit's end, are temporarily stunned. Mike Logan asks her husband if it's okay to give her a hug.
It's not a police procedural, but a large number of patients on Casualty would be treated a lot faster and more accurately if they were honest about the cause of their injuries and what they've been taking. The doctors don't even ask when the police are in the room, in the majority of cases, yet the patients still lie.
Bud Roberts: Well, the medical examiner faxed over more autopsy details for Agent Turque.
Harmon Rabb: Can I see them?
Bud Roberts: Sorry, sir. Agent Turque instructed me that these were for his eyes only. In fact, his exact words were, "Don't hand any faxes over to Commander Rabb."
Harmon Rabb: I see.
Bud drops one copy of the report for Harm to pick up.
Done for laughs on Psych, when Lyin' Ryan witnesses (and is accused of committing) a murder in his apartment. In addition to the outrageous story he concocts about the real assassins, he tells Shawn and Gus that he can provide a time, place, and name of the next "hit" to gain their trust. Unfortunately, his details are so vague that they're almost useless.
Lyin' Ryan: The time was 10:00.
Lyin' Ryan: ...to 4:30.
Shawn: 10:00 to 4:30.
Gus: A six hour window? What, do your killers work at the cable company?
Discussed in an episode of Babylon 5. After interviewing a member of station security regarding his gambling habits, Garibaldi states that he's lying. Sinclair responds that everybody lies. The guilty lie because they have no other choice, and the innocent lie because they don't want to be blamed for something they didn't do.
This is a large part of Ace Attorney, particularly in the later games where you have to break the "Psyche-Locks" that represent their secrets by showing evidence to them.
Justified the first time you have to use this ability. The person whose secret you're trying to uncover is a five-year-old girl. She's worried she'll get in trouble if she admits what she's hiding, and is too young to understand that she's impeding a murder investigation.
And subverted by Wendy Oldbag - the Locks say her secret's buried deep, but she wants to tell - three of them break in one go, and she gives you the last one free because she's so droolingly into the case's victim.
Averted in Ace Attorney Investigations with Palaeno, who is quite possibly the most helpful, least secretive and least incorrect witness in the whole series. Which is extremely effective because Genre Savvy fans of the series will instantly assume Palaeno is the real killer just for that, plus his huge mane of hair that'd be perfect for a confession freak-out.
Of course, the Repliforce crosses the Moral Event Horizon by turning their peaceful rebellion into a violent one. Reasonably, the hunters (X and Zero in this case) try to talk Repliforce out of their rebellion, but everything's gone too far. This is the event that ends up making X seriously question the inherent violence in the Maverick Hunter system (previously, he was a reluctant, but willing fighter), and gives Zero a Heroic BSOD, both of which come back to haunt them.
In L.A. Noire, everyone is holding out something from you. Everyone. Even people who want to be helpful (though in many cases, it's not a question of them purposefully withholding information, but rather directly answering the question, requiring a follow-up on a different track).
Example in an early interview: When talking to a witness who is otherwise totally uninvolved and has nothing to fear, she'll still lie to you. If you catch her out, she admits that she was holding back some info in hopes of selling it to the newspapers.
In the diagnostics portion of Trauma Team, roughly half the patients fall into this. Another is perfectly helpful, though wanting to get everything finished quickly, and another is... discreet.
In the second game, Lucy and Dr. German lie about their alibi, making them seem suspicious. When they come clean about it, you learn that it has nothing to do with the murder.
The witnesses from the third game are all aggressive and reluctant to co-operate with Jack. Justified, as they know Vince, so they are aware they can't trust the police.
Most of the people you save in Ghost Trick are understandably quite pleased that you're trying to stop them from dying, and will offer whatever help they can come up with. Jowd, on the other hand, is something of a Death Seeker, and spends the whole time offering insincere apologies for your trouble and making snarky comments instead.
Call Of Cthulhu: Dark Corners Of The Earth has the citizens of Innsmouth whose response to inquiries regarding a missing person mostly consist of a barely human guttural growl telling you to get out of their face. Of course, anyone at all familiar with the Cthulhu Mythos is hardly surprised; the citizens of the town are pretty much Half-Human Hybrid people of the worst kind who follow the teachings of the local Path of Inspiration and worship an Eldritch Horror or three.
If you are arrested in the United States any good lawyer will advise you to remain silent, and wait for your lawyer to be present, even if you are completely innocent and think that talking to the police will help convince them of your innocence. Talking to the police cannot help you avoid being arrested (they aren't showing up at your door to decide whether or not to arrest you — they're showing up at your door because they've already decided) and anything you do say can be used against you. The prosecution cannot always use the fact that you refused to answer police questions against you. Sometimes, however, they can. That recent ruling strongly indicates that your best approach is to answer all questions with "I wish to speak to a lawyer and will not answer any questions until one is present," even if they're asking something completely innocuous. It's like the court wanted people to be as unhelpful as possible...
In Scotland, due to differences in the legal system, the right to silence is completely unqualified and lawyers are forbidden from implying in court that relying on it impugns your credibility.
In Canada, you do not have the right to have an attorney present while being questioned - but you do have the right to speak to one before being questioned, and you always have the right to say nothing.
Stop snitching. Rapper Camron infamously said in an interview that if he knew he were living next to a serial killer, he'd move rather than go to the police - or help them in their investigation.
Field Marshal Bill Slim reported on the "helpfulness" of British civilians in Burma early in World War II. His best example was of a man he asked for help buying horses:
Civilian: Oh, you should have asked X. He could get all the horses you need, at reasonable prices.