18 Pa.C.S. § 5505

A person is guilty of a summary offense if he appears in any public place manifestly under the influence of alcohol or a controlled substance, as defined in the act of April 14, 1972 (P.L.233, No.64), known as The Controlled Substance, Drug, Device and Cosmetic Act, except those taken pursuant to the lawful order of a practitioner, as defined in The Controlled Substance, Drug, Device and Cosmetic Act, to the degree that he may endanger himself or other persons or property, or annoy persons in his vicinity. A person convicted of violating this section may be sentenced to pay a fine of not more than $500 for the first violation and not more than $1,000 for the second and each subsequent violation.