An investigative series deploying algorithms to detect copy-paste legislation

An investigation by USA TODAY, The Arizona Republic and the Center for Public Integrity

USA TODAY and the Republic found at least 10,000 bills almost entirely copied from model legislation were introduced nationwide in the past eight years, and more than 2,100 of those bills were signed into law.

The investigation examined nearly 1 million bills in all 50 states and Congress using a computer algorithm developed to detect similarities in language. That search – powered by the equivalent of 150 computers that ran nonstop for months – compared known model legislation with bills introduced by lawmakers.