So maybe some new tech there but I would be surprised.I would even put yeast down the toilet every time I changed the batteries in the smoke detectors. 

From what I have read, it is not legal (at least in TX) for an owner to charge rent from two different tenants on the property at any given point.Please advise.Xian

Then, schedule an inspection in a month or so saying you need to check the smoke detector batteries and check for plumbing leaks. 

Make sure the smoke detectors meet requirements - some have to be replaced if a certain age, make sure the batteries are new.  

First let me say this- if it is more than replacing light bulbs, batteries and filters I don't let tenants touch anything.

I allow pets, but I don't charge rent for them. 

Then a guy popes out of their unit and says to my tenants "Thanks for the battery bro".

I used to be an onsite manager less than 6 months ago in CA so that would be my feedback.the other stuff is not that important, it won't net much gain in rents.your annual maintenance is critical on each unit  - caulking, changing flappers and batteries on smoke detectors, co detectors and changing air filters.

If I in fact remove that tenant's hand upon being 3 days late (with their willingly given permission).... a signed document allowing me to do so would not prevent a charge of battery levied by law enforcement.No Lease Agreement can supersede Federal or State law.

My main complaint with some section 8 tenants is they are generally a little more needy with things like changing light bulbs, batteries in smoke detectors, changing filters, and other small maintenance items.