Any person who is found in any public place under the influence of an intoxicating liquor, drug, controlled substance, or any combination of the above stated in a condition where he or she is unable to exercise care for his or her own safety or the safety of others, or obstructs or prevents the free use of any street, sidewalk, or other public way (passed out in a public place).
From the Legal Resource Center (LRC):
The most common questions about DIP involve "How drunk do you have to be to be cited?" The standard is that you are intoxicated to the point that you are a danger to yourself or others, and are in public. If you are inside a residence, regardless of the degree of your intoxication, you are not drunk in public. If you are walking down the street, an alley, or a park, you are in public. Typically, a student who receives a DIP falls within a few categories of conduct: passed out; stumbling home, isn't sure exactly where home is; walking alone late at night with alcohol on his/her breath; walking with a group of people but is clearly being held up by 1 or more among the group; vomiting into a planter or trash can; acting in a manner that a sober person would not. The law requires that when an officer makes an arrest for Public Intoxication, he must take the individual into custody until they sober up and can care for themselves. This is a safety issue, not because the officer wants to be mean to you. If you are too drunk to care for yourself, then you should not be left alone. It is for a judge or jury to determine whether you really were too drunk by legal standards. No test is taken to measure your BAC, and there is no requirement that it has to be taken. It is objective observations by the officer that support the arrest.