Alarms installed in this manner must comply with the National Fire Protection Association standard 720, or any successor standard for the operation and installation of carbon monoxide alarms.Up here in the sticks we can use the battery/plug in detectors even when doing renovations.

Some court somewhere will clarify that...until another court rules differently.If you aren't willing to try to comply with the law, then you will be in trouble.

My attorney said my email was perfect and if they don't comply, I can give a 30 day notice.

Normally I could get a tenant to comply. 

I would serve her a Notice to Comply, which states she needs to clean it up, and be as specific as you can possibly be.

You want to know the process going in when the tenant is selling drugs, not complying w/ the lease, abandonment, non-payment, etc. 

It also gives you protection since the neighbors complaints can't go anywhere if you're complying with the conditions of the CUP.

You run background checks on all adults unless it is a pointless case (example of that is somebody who just moved to the  USA from another country and has SSN - so you could run a credit check with the SSN but it would show you nothing).When you decline an applicant after having pulled a credit report, you have to comply with the FCRA in the rejection letter.

Do you think that if I went to the tenant with something in writing as well and a friendly conversation, the risk of her losing her voucher for herself and her two kids would be enough to comply? 

If so, the tenant must comply or be in violation of the lease.