Abstract: A breathalyzer car key locking device comprises a mouthpiece, an alcohol sensor, a locking mechanism, and a processing element. The mouthpiece receives breath from a user. The alcohol sensor receives the user's breath from the mouthpiece, determines a blood alcohol level of the breath, and outputs an electronic blood alcohol level signal whose voltage level or digital data value varies according to the determined blood alcohol level. The locking mechanism exists in one of two states including a locked state and an unlocked state. The locking mechanism retains a car key in the locked state and releases the car key in the unlocked state. The processing element receives the blood alcohol level signal from the alcohol sensor, and transmits an electronic locking signal that places the locking mechanism in the locked state when an aspect of the blood alcohol level signal is greater than or equal to a predetermined threshold.

Abstract: A breathalyzer car key locking device comprises a mouthpiece, an alcohol sensor, a locking mechanism, and a processing element. The mouthpiece receives breath from a user. The alcohol sensor receives the user's breath from the mouthpiece, determines a blood alcohol level of the breath, and outputs an electronic blood alcohol level signal whose voltage level or digital data value varies according to the determined blood alcohol level. The locking mechanism exists in one of two states including a locked state and an unlocked state. The locking mechanism retains a car key in the locked state and releases the car key in the unlocked state. The processing element receives the blood alcohol level signal from the alcohol sensor, and transmits an electronic locking signal that places the locking mechanism in the locked state when an aspect of the blood alcohol level signal is greater than or equal to a predetermined threshold.