What should you look for in a top tier security guard? First and foremost is training and experience. What kind of a training process did this security guard go through? How many years has he been working in the private security field? The agents at Spear Security Denver represent the cream of the crop. This elite firm puts all of its agents through an intense screening and training program. If the glowing testimonials of past clients are any indication, the security guards at Spear Security Denver embody the very best that private security has to offer: professionalism, passion, dependability, and dedication.