If the world seems like a safer place these days, thank a private equity investor the next time you see one. The industry has invested in 109 security-related U.S. or Canadian companies in the past ten years, according to the PitchBook Platform. Deal activity has gradually picked up over the timeframe, culminating in high-water marks in 2010 and 2012. The list includes dozens of electronic security companies and alarm system providers, but security needs can go deeper than that. Also PE-backed are Airborne Biometrics Group, a facial recognition software company, and B&B ARMR, a provider of anti-terrorist and crash-rated perimeter protection products.