They do not drug test.

Do they watch you drug test?

For any pre-employment drug test, they do not watch unless it's a super serious position in hard labor or government. Bear in mind, this is just for job which you're applying for voluntarily.

What happens if you test positive on a pre-employment drug test?

If you test positive on a pre-employment drug test during the initial screening, your sample will be sent for confirmation testing. If the confirmation test also reveals a positive result, a medical review officer will review the chain of custody of the sample and the results.