Should I accept only certified checks for First Month Rent?

[Jon K.]

I have another tenant moving in this week. They haven't signed/paid yet.

Should I accept only cashier's/certified checks, cash, or money orders for 1st month rent and deposit?

With it being so close to move in, they could easily give me a check now that bounces next week after they've moved in. I'm not doing a credit check, just job/background. This is a roommate/tenant situation.