Dude, if the seroquel controls his schizophrenia/mental issue then he can do whatever the fuck he wants.
I have experience in construction. My pops has his own business and I've worked for him for 10 years.
There are drug addicts, gamblers, liars and cheaters who own businesses. If these fuck heads can own a business, then anyone can.
This guy my pops did business long time ago with was very successful at his peak. When he started a coke habit, shit went down hill for the guy. He started taking deposits for big jobs ...and never even started them. Basically, stealing money from people. Illinois state attorney Lisa Madigan is in the process of suing him right now.
If he's honest and does a half way decent job, then by all means let a man work.
What's the other option? Him beeing a leech on society and using up public aid benefits?