Although encouraged by the progress, researchers concede that breath testing is more challenging than it may seem.
If medical breath testing follows a similar pattern of shrinking size and price, the next generation of texters may be able to blow into a thumb-sized device attached to a smartphone to learn about their health.
In the league table of English and Welsh police forces with the highest falls in breath testing
, Merseyside was 11th.
While breath testing for alcohol is standard practice in many countries across the world, its introduction in Mexico has sparked public debate.
The city, now run by the center-left Party of the Democratic Revolution (PRD) began using breath testing shortly after a consultancy headed by former New York City-Mayor Rudolph Giuliani issued advice to Mexico City's cops on crime busting.
The British Airline Pilots Association (BAPA) has rejected calls for random breath testing
of pilots and is instead advocating a system of 'Peer Pressure' to help flight crew members who may have alcohol or other drug problems.
Drink driving is anti-social and wrecks lives and families, and police will continue to carry out breath testing
at every opportunity to further reduce the amount of drivers who flout the law."
"It also introduces the option of breath testing
when managers have cause to believe a member of staff may not be fit for duty due to alcohol."
There would appear to be subtle differences between a driver being stopped randomly and random breath testing
but the distinction is there.