Re: The Hottness of "Wallace/Hodges"!!
If they are at a crime scene or in an position such as Hodges was when they were running the test in "A bullet runs through it". Also only stands to reason would you want to be a tech that rarely if ever at a scene or doing a test and have a cop or someone say "Hey you, who are you?" with the vest that says LVPD on it, they know they are with either the cops or the lab.
Actually all of them should be wearing the vests including the regular team members, but they are usually escorted by the cops so its easier for them.