Pa. Const. art. VII, § 4
Method of elections; secrecy in voting
Effective Nov 5, 1901(Nov. 5, 1901, P.L.882, J.R.2)Commonwealth of Pennsylvania
All elections by the citizens shall be by ballot or by such other method as may be prescribed by law: Provided, That secrecy in voting be preserved.
(Nov. 5, 1901, P.L.882, J.R.2)