If any person is intoxicated in public, whether such intoxication results from alcohol, narcotic drug, or other intoxicant or drug of whatever nature, he is guilty of a Class 4 misdemeanor. In any area in which there is located a court-approved detoxification center, a law-enforcement officer may authorize the transportation, by police or otherwise, of public inebriates to such detoxification center in lieu of arrest; however, no person shall be involuntarily detained in such center.