Recap / Family Guy S 3 E 1 The Thin White Line

In the first half of this two-part episode, Brian becomes a drug dog for the Quahog police to combat with the boredom in his life, but soon becomes addicted to cocaine and ends up in rehab. Meanwhile, Peter wins a vacation during Happy-Go-Lucky Toys' company picnic, but ends up in rehab as well after Lois cancels the trip because of Brian.

http://tvtropes.org/pmwiki/pmwiki.php/Recap/FamilyGuyS3E1TheThinWhiteLine