Watch 21 Jump Street (2012) Online

In high school, Schmidt (Jonah Hill) was a dork and Jenko (Channing Tatum) was the popular jock. After graduation, both of them joined the police force and ended up as partners riding bicycles in the city park. Since they are young and look like high school students, they are assigned to an undercover unit to infiltrate a drug ring that is supplying high school students synthetic drugs. 

A pair of underachieving cops are sent back to a local high school to blend in and bring down a synthetic drug ring. 

Directors: Phil Lord, Chris Miller
Writers: Michael Bacall (screenplay), Michael Bacall (story)
Stars: Jonah Hill, Channing Tatum and Ice Cube