You'd think rule number one of running a meth lab is that you don't make a big sign advertising your meth lab.  That MIGHT draw attention. 

--On Friday morning, police in Memphis, Tennessee spotted a driver in a red pickup truck with the words "METH LAB" written on his back windshield and driver's side window.

 --They pulled him over and, believe it or not . . . the truck actually WAS a mobile meth lab. 

--Hazmat crews ended up removing all the dangerous chemicals from his truck.  The driver was arrested on outstanding warrants and for new meth charges.  

(NBC 10 - Knoxville)