They put their lives on the line to serve and protect, but several police dog units could now suddenly be behind illegal searches.

That has police scrambling to literally teach old dogs new tricks in states where medical and recreational cannabis is now legal.

Most drug-sniffing dogs still alert police to what is now a legal drug, which could result in numerous illegal searches.

Washington State recently legalized pot for personal use and prosecutors there warn police there may now need more than a dog’s alert for a search warrant.

That's why the Seattle Police Department is among the many no longer training drug-sniffing dogs to detect pot.

Police are also trying to retrain the dogs by desensitizing them to the drug, which is something law enforcement agencies across the country are going to have to consider should voters in their state also approve legalizing pot.

