Welcome back to The Week in Weed, your Friday look at what’s happening in the world of legalized marijuana.

A field sobriety test is used when a motorist is suspected of reckless driving, and a breathalyzer is used to gauge the level of alcohol in a driver’s bloodstream. But there’s nothing similar to a breathalyzer for testing whether someone is driving while under the influence of marijuana.

DENVER — Weed is winning in the polls, with a solid majority of Americans saying marijuana should be legal. But does that mean the federal government will let dozens of state pot experiments play out? Not by a long shot.

A formal recount of Maine’s election results on recreational cannabis legalization is set to begin Monday and is expected to take four to six weeks and cost the state up to half a million dollars.