Why not use a camera pointed out over the yard connected to a recorder that videos the villains in flagrante delicto. Maybe park a vehicle in front of the house with a sign in a window of the vehicle (not the house or in the yard) that warns folks the area is under surveillance and being videoed. Then, when the camera picks up the doings of the miscreants on the private property within the yard publicize it on Youtube, Facebook or in the unmentionable online newspaper that publishes photographs of bad parking. Maybe the homeowners could file a complaint for trespassing with the police.
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"No one is more hated than he who speaks the truth." Plato
“To argue with a person who has renounced the use of reason is like administering medicine to the dead.” Thomas Paine
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