BB background check process
Wondering if people can speak to the background check process, and if most banks, especially BB, apply the same process (employment record, drugs test, criminal record). I'm going through the lateral hiring process at a European BB in NYC and am curious how this process works. I've read that at some places results come in only after you've started working. I wouldn't want to quit my current banking job and start a new one, only to learn a few weeks into my new job that my background/record check doesn't pass. Are some third parties that the BBs employ for checks more detailed and go deeper than others?
Any insight would be much appreciated.