Are Smart Phone Breathalyzers Effective?

How the manufacturer calibrates the breathalyzer?

BACTrack - Super-accurate Smartphone Breathalyzer - Thrillist Nation

Six attempts at a smartphone-connected breathalyzer

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FSA or HSA EligibleiSOBER10-Alcohol Breathalyzer Connectable with Smartphone App - SENTECH USA

BACtrack Mobile Smartphone Breathalyzer (2 Pack), Professional-Grade Accuracy, Wireless Connectivity to Apple iPhone, Google & Samsung Android Devices

Best Buy: BACtrack Vio Smartphone Keychain Breathalyzer for Apple® iPhone® and Most Android Devices White BT-M2

This Smartphone Breathalyzer Will Keep You From Embarrassing Yourself At The Company Party

OOPSY smartphone breathalyzer

Alcohol Breathalyzer for Fleet Safety Compliance – Tampa Bay Monitoring

Can Breathalyzer apps tell you whether you're legally drunk?