My son does this constantly. I would pity an officer who would try to ticket me.
Had this happen with one of ours.
Christmas day, number two in the front yard while we were loading the stuff in the car to go to grandma’s.
Your son may do it but ALSO most middle and late-middle aged men with an enlarged prostate do it when they’re outside trying to take care of their lawn and leaves, etc. and get hit with the sudden urge, and don’t think they can get into the house in time, so they duck behind a tree on their own property.
Have you told him you have an inside toilet ?