Personal security is a 24/7 job, to some it comes almost instinctively but others can find it very hard to develop.
These days if you travel internationally or you are going to be working in the emerging markets, you are running the risk of being arrested for some reason.
Tailored hostile environment training for those who operate in hostile environments, be it high crime inner city housing projects or third world war zones.
Electronic surveillance is a main intelligence gathering resource for governments, criminals, terrorists and private investigators.
Papillon, the first book I read in my early teens that helped lead me astray. It stresses values that are missing today like honor, respect and one’s word!