Tweets give game away

Some Twitter users are revealing the locations of police drink-driving checkpoints in Mexico City and the people behind the tweets could be prosecuted.

Public Safety Department spokesman Julio Iver said it is illegal for anyone to "divulge privileged information on police agencies", but he did not say what sanctions the Twitter users could face.

Mexico City police change the location of the breath-test checkpoints each day. Police cannot do roving tests from their patrol cars, because the city requires that a doctor be present to administer the exams.

A Twitter account has been tweeting the location of the checkpoints since at least December, apparently allowing motorists to avoid them.

Called "Anti Breath Test", the account now has 3400 followers.