Breathalyzer

2 clues
Trooper's device
Highway patrol device once trademarked by Smith and Wesson
Similar answers:
Abreath
Analyzer
Babysbreath
Badbreath
Badbreathandbeyond
Baitedbreath
Batedbreath
Breath
Breathalysed
Breathalyser
Breathalyzer
Breathcontrol
Breathe
Breathecheese
Breathed
Breatheeasier
Breathefire
Breathein
Breatheinandout
Breathenotaword