Had one phone interview and then one panel interview. I was notified during the phone interview that I had been approved for an in-person panel interview. They scheduled it for the next day. I completed the interview the following day, and the morning after that I received a phone call with an offer. There was no drug test, but there was a background check.

This was a long time ago, but the interview process was typical. You start with an HR phone interview, then they ask you to come in person. The in person interview was with two managers that asked the typical questions.