So basically this guy got caught because he sent threating letters in the mail and did his business in his own local area. * Step 1: Don't do your business close to home. * Step 2: Don't talk about it, with anyone ever, not your mum, not your bff, not your wife, not in zodiac killer cryptic notes. * Step 3: Seriously don't talk about it, the number one way crimes are solved is because braggarts get outed by family members or friends. * Step 4: Don't leave unnecessary amounts of evidence. * Step 5: Remember to have fun.