Does Twitter drug test?

No, Twitter does not drug test, require drug testing as a pre-employment mandate, or drug-test workers randomly. They are concerned with you doing your best work. That being said, you still should probably not tweet about any recreational activities you engage in while employed at Twitter.

Twitter is a smoke-free workplace. Employees may smoke only outside of the building in designated smoking areas. Twitter encourages all of its employees to quit tobacco products and offers free smoking cessation programs to any employee interested in quitting.