Also, depending on what county you live in, it may be illegal for the owners to allow the pet to roam freely, and to damage, soil, or defecate on other people's property. In Montgomery County those prohibitions apply to all animals, including cats. You can make anonymous complaints to the animal control agency, but unfortunately most owners tend to have a pretty good idea who made the complaint, so it can get awkward. Also, there's a natural reluctance to call in the authorities.
There is no law in Fairfax County against free-roaming cats; the Shelter asks residents to leave healthy stray cats where they find them. See below.
Q: There is a healthy stray cat that keeps coming into my yard. Can I bring it to the shelter?
A: In Fairfax County, there is no law against free-roaming cats. The majority of healthy, free-roaming cats do have a nearby owner. Do not attempt to trap or catch the cat to bring it to the Shelter. If the cat is a nuisance, there are number of harmless cat repellants that are sold at pet stores and home good stores.
I've just had a bad experience with a neighbor who my cat followed to his house. The mailman told me where the cat went and when I approach this neighbor he started lecturing me how free roaming cats were illegal (again, they're not) and they are threat to birds (dude has like a dozen feeders in his front yard) and he tried to take it the shelter. (The mailman told me that he told this guy where the cat belonged but he apparently didn't care.) The neighbor said he tried to take the cat to the shelter but it got out of the car a few blocks away. I'm not sure I'm buying that story but we have not seen the cat since and that was five days ago.
Cats are considered personal property in Fairfax County. This guy knowingly took my cat even though he knew exactly where it lives because he hates cats and wanted to make a point. I am now looking to prosecute him. I've already filed a report with the cops. I am not playing. I've already talked to a lawyer, too. I am going to make this guy's life a miserable hell in any legal way I can.
It's not just about revenge. I suspect this is not the first time this guy's had done this and I don't want him to do this to other people's cat in the future.