Many years ago, I attended college in a small town in East Texas. There was a day care center behind the rent house I lived in and possums used to love to get into their dumpster to eat out of the diapers. They also liked to crawl up into the walls of my house. I had a good relationship with the local PD and told them I was planning on trapping the possums, then dispatching them with a firearm - my plan was to use .22 caliber shorts in a bolt action rifle. The PD asked that I call them first before shooting so they would be aware as I lived about a 1/4 mile from the station, and warned me that I'd have to use something larger to be effective. Well, one late night I caught a big possum in the trap and he wasn't happy at all. I loaded the rifle, and phoned the PD. I then waited for the possum to settle down and at almost contact distance, I fired the .22 into his head just behind the ear. The possum immediately vomited some nasty looking green colored drool and started hissing at me! Playing possum my **s! I went back inside the house and phoned the PD to report my results. The desk sergeant then asked what I was planning on doing. I replied: ".38 Special wadcutter to the head"; and the desk sergeant replied: "good idea, now shoot him so we can all get some sleep" and hung-up. The .38 Special wadcutter is an excellent remedy for possum headaches. I threw his carcass into the day care's dumpster, and it did not have a deterrent effect on his/her fellow possums. I eventually took to dunking the entire live trap into a trash can full of water and just drowning the suckers.
Best regards,
Dave