Typically employers have a pre-employment screening process in place for summer interns/analysts/associates, which may include, among other things, screening for illegal drugs and controlled substances; investigating and verifying criminal history; and verifying education and prior employment history.

Do most interns get drug tested?

Yes - they are done at any time and before starting position.

Can you still get hired if you fail a drug test?

Failing a drug test can drastically reduce your chances of getting hired, but not entirely. Anyone applying for a job and who fails a mandatory drug test is highly unlikely to get hired.