I recently applied for a position and went through the interview process. To my surprise, the company asked me to complete a background check and drug screening on the same day as the interview. The following day, I received paperwork for direct deposit forms. I'm feeling a bit uneasy because I haven't received an official offer letter yet. Is it common for companies to request onboarding paperwork before sending an offer letter? I'm starting to wonder if this is a legitimate opportunity or if I should be cautious.