In research and film photographic tests are given. (Image taken from Wikipedia).
According to a private investor with Localizaciones Rápidas, 90 percent of customers are concerned with infidelity in a relationship. The remaining 10 percent are companies that monitor employees and situations related to child support. Typical business cases involve scams, embezzlement of money, and abuse of trust. Child support cases are usually related to tracking a subject for unpaid support obligations.