Big dilemma. Help appreciated?

I totally agree that you should not let him use your ID, if found out you will be in serious trouble. Maybe you could tell him you do not want to take your passport out with you because it is a VERY important document and can cost �80 - �100 to replace if you lose it. It's also not wallet size! So if it's in your back pocket could so easily fall out when you take your wallet out! I can't think of anything else sorry! Good luck!