Tell-tale pink powder stains on his lips led to the arrest of a man for trying to tamper with evidence by eating it.The man, Shawn Edwards, 22, was bound to the grand jury on charges of tampering with evidence and possession of drugs.His problems began when he didn’t buckle up. McMinnville Police Sgt. Ben Cantrell pulled him over for a seatbelt violation. It was as he approached the car, Cantrell said he could see Edwards putting things into his mouth and chewing them.“I observed a pink powder on his lips that appeared to be from tablets he had inserted into his mouth,” Cantrell said.Cantrell said he ordered Edwards to spit the tablets out of his mouth.