you definitely can and should express your concerns, but have to understand he is going to do what he is going to do. so now is the time to see what boundaries you want to put in place.....the actions YOU will take if HE does X, Y, Z.
he either learned a lesson by being in jail......or he did not. he will either follow thru with what he SAYS he is GOING to do - stay clean, get a job, etc., OR he'll fall back into old patterns. he's got a record now. so jobs will be that much harder to come by.
more shall be revealed. you take care of you, keep your focus on the good things you want in YOUR life.....and then measure that up with what your ABF brings to the table.........don't sacrifice your own values and ethics just to be with him.