If a person wants to prove a crime, they have to make sure that they had some kind of solid evidence. Unfortunately, this can sometimes be difficult to come by. For example, if a business owner thinks that one of their employees is stealing money from the cash register, but they cannot prove that he or she has done it, they are going to need to find a way to prove that before they fire that individual. This would only be fair. Fortunately, there are different types of spy cameras that are available. Learn more about spy cameras at the site: http://www.eyespysupply.com/spy-cameras.html.