At the citizen ship interview Officer told my husband he would receive a letter in the mail deciding outcome ?

I assume you are trying to predict what the letter may say. What was he arrested for in 1991? When, where, why, and how was he "detained" in 2015?...

It is ultimately up to the employer. If they have internal policies that your record places you in violation of, they may choose to let you go or...

VASAP will probably remove you from the program for your relapse and new charges. However, if you are able to attend and complete, any compliance...

How can I obtain my work permit after being granted withholding of removal?

. Given you circumstances you should use an attorney and file the I 765, and make sure to be well behaved in the interim.