[s2e7] Lockdown -

: The HAZMAT team eventually confirms the powder is harmless baking powder (or otherwise non-toxic), and the lockdown is lifted. Brooklyn Nine-Nine recap: 'Lockdown' - Entertainment Weekly

: Following Amy’s advice, Jake eventually regains control by dropping the "fun boss" persona and threatening to arrest anyone who challenges his police authority. [S2E7] Lockdown

In , Jake Peralta is left in charge of the precinct on Thanksgiving while Captain Holt and Terry attend a charity event. After Boyle accidentally opens a package containing a mystery powder, the precinct is placed under a HAZMAT quarantine. Survival Guide for a Precinct Lockdown : The HAZMAT team eventually confirms the powder