Driving Under  the Influence (DUI)
Pennsylvania DUI laws establish separate categories of DUI as follows:  
 
General Impairment (75 Pa.C.S. Section 3802) (a) - (1) An individual may not be in actual physical control of the movement of a vehicle after imbibing a sufficient amount of alcohol such that the individual is rendered incapable of safely driving, operating or being in actual physical control of the vehicle; (2) An individual may not be in actual physical control of the movement of a vehicle after imbibing a sufficient amount of alcohol such that the alcohol concentration in the individual's blood or breath is at least .08% but less than .10% within two hours after the individual has driven, operated or been in actual physical control of the movement of the vehicle.  
High Rate of Alcohol (75 Pa.C.S. Section 3802) (b) - An individual may not be in actual physical control of the movement of a vehicle after imbibing a sufficient amount of alcohol such that the alcohol concentration in the individual's blood or breath is at least .10% but less than .15% within two hours after the individual has driven, operated or been in actual physical control of the movement of the vehicle.
Highest Rate of Alcohol (75 Pa.C.S. Section 3802) (c) -  An individual may not be in actual physical control of the movement of a vehicle after imbibing a sufficient amount of alcohol such that the alcohol concentration in the individual's blood or breath is at least .16% or higher within two hours after the individual has driven, operated or been in actual physical control of the movement of the vehicle.
Controlled substances (75 Pa.C.S. Section 3802) (d) -  An individual may not be in actual physical control of the movement of a vehicle under any of the following circumstances: (1) there is in the individual's blood any amount of a (i) Schedule I controlled substance, as defined in the Controlled Substance, Drug, Devise and Cosmetic Act or (ii) Schedule II or Schedule III controlled substance, as defined in the Controlled Substance, Drug, Devise and Cosmetic Act which has not been medically prescribed for the individual or (iii) metabolite of a substance under paragraph (i) or (ii).