[Crowbob]

Here's what I came up with: If part of the goal is to identify the perps, a recording device would be needed, image generation is needed, stealth is needed, reliability is needed, and remote operation is needed. Motion sensors won't work if the perps operate in stormy weather (they detect blowing leaves, swaying limbs and grasses, and of course, their own movement due to wind). A motion sensor attached to an alarm would beg for deletion the first time it went off unintentionally. Be prepared to sustain at least one more attack as recording them in the act is a strong negotiating tool. As you install the system, also install a subtle notice such as a hand-made "No Trespassing" sign. The perps are operating under the notion that you are aware and frustrated. Satisfy their hunger. They will have confidence in their next and final strike, which of course, is a trap. Formal courts of law may be useless, as the privacy implications of secretly recording are far from settled. In the long run, subsequent to your identifying the perp(s), it would be best to help him realize it is in his best interest to cease and desist. Uprade and install the alarm after their strike to further advance their craving for escalation and daring. By then, they have aleady been trapped. Begin the negotiation.