If your landlord requests you pay rent strictly in cash, that most certainly opens up some room for skepticism. You shouldn't immediately identify him as a crook, but it's in your best interest to have evidence that you paid your landlord for rent. According to D. Currey of dslreports.com, "As long as you have a receipt you should be good to go until he goes to jail." If you are going to pay in cash because you enjoy handling paper and/or you don't have a bank account, it's wise to hand the money directly to your landlord and not his wife, son, handyman, or mistress.