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I've seen en episode of a TV show but I don't remember what it was exactly.
Part of the story is as follows:
A lawyer comes to visit the protagonists.
A rich man died and left a will to display his diamonds for Christmas at local museum.
Lawyer worries about gems to be stolen and asks for increased security.
During the exhibition, a young child with his grandmother tries to touch the jewelry.
This immediatly gets attention of people but it was not a theft. Just small happening.
When the exhibition is over and the jewelry is checked, it turns out to be fake!
The culprit who stole the jewels turns out to be the lawyer.
Progagonists point the lawyer because all information about the story (a rich man, diamond, a will... ect.) was only coming from the lawyer and He was in position of advantage to infrom the case and therefore can easily manipulate the scene.
The lawyer gave some money to the kid and made him touch the diamond. This is revealed after the case is solved.
I thought it was 'White Collar (USA network, 2009~2014)', but I guess not.
Thank you for all your efforts in advence!