Lex posterior derogat priori - "Later law removes the earlier." More recent law overrules older ones on the same matter.⏎
Lex retro non agit - "The law does not operate retroactively." A law cannot make something illegal that was legal at the time it was performed. See ex post facto law.⏎
Maleficia propositis distinguuntur - "Evil acts are distinguished from (evil) purposes" or "crimes are distinguished by evil intent." Evil acts are distinguished from evil purposes[4] crimes are distinguished by the intention[5]⏎
Nemo auditur propriam turpitudinem allegans - "No one can be heard, who invokes his own guilt." Nobody can bring a case that stems from their own illegal act.⏎