KNOXVILLE, Tenn. (WVLT) — After being hit with five robberies in five months, Lee’s Food Market hasn’t seen a thief since April. The installation of a crime fighting spray system six months ago, may have something to do with it according to local law enforcement.

The Knox County Sheriff’s Office says the intruder system is effective. During a meeting at Lee’s Food Market on Rutledge Pike Friday morning, officials and SelectaDNA reinforced how the technology is making criminals think twice.

A synthetic DNA spray unique to its location tags intruders breaking, the spray then sticks to their clothes and skin for several weeks. The spray can been seen using a UV light and officials can then connect the suspect to the crime if they spray matches the one from the scene.

The last robbery at Lee’s Food Market took place on April 1, 2015. The convenience store was one of the first businesses in the country to get the technology.