The published information should not be made available in app as it gives a chance for the drunken drivers or illegal activities to escape from the law. The check point officials should train well so that the person should be treated with dignity. Checkpoint reduces alcohol related crashes around 20 percent according to US CENTRES of disease control report. App helps the people to plan in advance which route to be taken and can give rise to loss of life.
In some states Dui check point is prevented. It is considered illegal by law. So these states such as Texas, Washingon, Alaska, Michigan, Oregon etc consider violation of civil rights. Drinking and driving is one of main causes of road accident. Sharing of information will only gives to this habit of drinking and driving, driver taking alternative route to escape. This should not publish for encouraging responsible drinking.
Regarding law, according to US law, drivers above 21 with blood alcohol concentration (Bac of .08 percent) is considered illegal. It is unethical to share information, as Dui check should be random and confidential. Sharing information creates loopholes in the law.