Denied apartment based on not ping criminal background check but they won't give details?

Location : Michigan - I applied jointly with another person for an apartment at an apartment complex. They denied our application saying this person hadn't ped their criminal background check but would not give us specifics and would not divulge their source. When you are denied something based on credit they have to tell you where (what credit bureau, etc.) they obtained their information and will usually even detail the specific credit issues (delinquent account, etc.). Isn't there a similar law when denying somebody based on not ping a background check? Aren't they obligated to tell this person exactly what information they are basing the denial on and where they obtained that information? Also we had no problem ping the background check at the apartments where we currently reside. (By the way if you don't have the intelligence or knowledge with which to answer my question, just leave... and save any dumb commentary or personal judgments for others of your level) Thanks!