This is an exercise in futility and done at great taxpayer cost.
"Officers check thousands of vehicles for drunken drivers at sobriety checkpoints but find them less than 1 percent of the time.
Between Jan. 1 and mid-September, the Ohio Highway Patrol conducted 135 sobriety checkpoints, which resulted in 222 operating a vehicle while under the influence, or OVI, arrests. That represents 0.4 percent of all vehicles checked for impaired drivers, according to a CentralOhio.com investigation of patrol reports.
More than a third of sobriety checkpoints conducted yielded no OVI arrests. Thirty yielded no citations for any offense, including driving without an operator’s license or safety belt violations, according to the reports."
The only explanation I can figure out is that certain people are making money from this... at the expense of everybody's rights.