Previously, we had to deal with the son smoking pot in the common area, but that seems to have stopped upon our request.  

Ross Valley (particularly San Anselmo) is smoking hot. 

Pre-screening is very important, so I thought it was important that I speak personally with every potential tenant on the phone to go over our requirements (income = 3xRent, no smoking, rules about pets, etc.)

Found quite a few things: leak in kitchen sink (my contractor is going to repair that for us based on his 1-year labor warranty); smoking in attached garage (going to ask tenant to stop doing that due to "non-smoking" clause in lease).  

How about smoke detector batteries.

Such as smoking inside property,  or having a unauthorized pet and etc...

1942 Bisbee Lane is a 2 bedroom duplex.This is a smoke free building.

Here is a quick list of my general advertising qualifications:Monthly income must be x or higherNo criminal historyNo evictions on your credit reportX dollars application fee3 referencesStable employment of 1 year or moreNo smoking on the premisesPets on a case by case basisOnce you lay this out they know what you expect!

Pay special attention to smoke detectors and carbon monoxide detectors and their placement.

Still, it says private (as opposed to municipal/gov't) landlords CAN prohibit firearms, just as landlords prohibit pets, smoking, and many other things.