Years back, I used to bet a security system installer that I could beat any of his systems on our new homes, with no damage at all to the property (as in, no broken windows or obvious B&E signs). He put his business card with a handwritten message on it in the middle of the master bed floor, and I had to present it the next day to win without tripping the system. I only had the advantage of knowing that as a matter of design, he didn't put motion detectors or pressure pads in bedroom areas where people might get up at night to use a bathroom. One was particularly tough, so I went up on the second story roof in the morning, pulled a few shingles, and with a cordless saw, cut myself an access and dropped into the attic, went over to the access panel and dropped right into the unmonitored bedroom areas hallway. Then back out and patched the hole. We argued about leaving evidence because I did leave a little bit of mess on the brand new carpet behind me, but I argued that with people living in the home, it would not have been distinguishable from household debris.