In recent years, the unpredictability of terrorizing events has kept Americans on alert, wary of threats to their safety and well-being.
A gunman killed 58 people attending an outdoor concert in Las Vegas last year. School violence has become commonplace enough that some teens carry bulletproof backpacks. And this week, at least a dozen homemade pipe bombs were mailed to outspoken critics of President Trump and forced the evacuation of a shopping mall in New York.
Specific threats and a general sense of anxiety, security experts say, are causing more people to seek the services of private security firms; some are hiring bodyguards and drivers trained to protect them in case of peril. more