<P> The minimum drinking age in Pennsylvania is 21 years . Minors are prohibited from purchasing, possessing, or consuming alcohol, even if it is furnished by the minor's immediate family . Persons over the age of 18 are permitted to serve alcohol, so an exception is made in the possession portion of the law in this respect . Many states have exceptions for consuming alcohol made for religious or medicinal purposes, but Pennsylvania does not have exceptions for either . </P> <P> A person under the age of 21 may also be arrested, charged, and convicted of underage drinking through constructive possession, even if they had not consumed any alcohol, simply by being in the presence of alcohol . This is mainly exercised when officials break up large parties or other events where alcohol is being consumed and the issuance of chemical tests to every individual is deemed impractical . </P> <P> Driving, operating, or being in actual physical control of the movement of vehicle under the influence is a crime in Pennsylvania, and is subject to a great number of regulations outside of the state's alcohol laws . Pennsylvania's maximum blood alcohol level for driving is 0.08% for persons at or over the age of 21 (with suspension of license on the first offense), and 0.04% for a person operating a commercial vehicle (0.02% for a school bus) with revoking of the license on the first offense . For those under 21, Pennsylvania follows a "zero tolerance" policy, meaning that any BAC over 0.02% is enough to warrant a DUI (the small allowance is for certain medicinal purposes such as some cold medicines that contain alcohol). Penalties include fines, license suspension, and possible imprisonment . </P>

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