Lauth Investigators first had to determine if there were environmental factors that were effecting the valves. Using risk-management criteria, it was determined that there were no leaks in the valves and they were in perfect working order. Next, investigators had to determine if human error might have been responsible for the spillage. Procedure for filling gas tanks involved the use of a hose which would prevent spillage. Undercover, investigators entered the refinery during operation hours to observe employees filling tanks. After surveilling daily operations, it was determined the alleged theft must be taking place outside of operation hours. Investigators placed hidden cameras trained on the target tanks in hopes of observing the theft. Footage from the hidden surveillance cameras revealed that an employee was, in fact, using an improper technique to fill cannisters with gas from the targeted tanks. The investigator visited the Subject’s residence and identified the same gas cannisters on the Subject’s property.