Pennsylvania classifies DUI charges into three separate tiers.  It is important to know which tier someone charged with DUI is in, because that tier (along with number of prior offenses within 10 years) dictates what potential minimum and maximum sentences he could face.

Tier 1: 75 Pa.C.S. 3802(a)(1) – general impairment 

75 Pa.C.S. 3802(a)(2) – BAC .08-.10%

Tier 2: 3802(a)(1) with accident

3802(b) – BAC .10 – .16

3802(e) – involving minors who are DUI

3802(f) – commercial and school vehicles involved in DUI 

Tier three: 3802(a)(1) – w/refusal

3802(c) – BAC .16 or higher

3802(d) – controlled substances