about permission with bank accounts

[iamgixxed]

my friend asked me to well this is a direct quote from his mouth"cash a check and pay for things using his checks" something else about try not to spend so much on yourself. Now its a problem that he doesnt like what i did now in all the confusion of that little talk...my thinking is that i had permission to write checks for him? I dont know... Now i guess the cops want to talk to me ive learned my lesson from previous experience im gonna shut my mouth and not say anything....or what should i do