The Pennsylvania Supreme Court held that the privilege against self-incrimination grounded in Article I, Section 9 of the Pennsylvania Constitution does not encompass a right to refuse a field sobriety test.
Commonwealth v. Hayes, 674 A.2d 677 (Pa. 1996)
Sean M. Girdwood,
Constitutional Law - Article I, Section 9 - Privilege against Self-Incrimination - Right to Refuse a Field Sobriety Test,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol35/iss3/11