After talking to a animal nusens control man, he states opossums temperature is lower than coons, skunks and outher mamals and that opossums do not generaly have the right temp for rabies to incubate, but that does not mean they can not get rabies. As for traping and releas you need to talk with your local agracultur or someone who deals in wildlife. But most states do have laws saying agracultur owners do have the right to shoot animals threatening there stock. I know in W.V. you have this right. You may talk to your county commisoner for help.