Section 51. Law may not relate to more than one subject, to be expressed in title -- Amendments must be at length.

No law enacted by the General Assembly shall relate to more than one subject, and that shall be expressed in the title, and no law shall be revised, amended, or the provisions thereof extended or conferred by reference to its title only, but so much thereof as is revised, amended, extended or conferred, shall be reenacted and published at length.