Retroactive

[Sarah]

Fitted or designed to retroact; operating by returned action;affecting what is past; retrospective. Beddoes. Retroactive law orstatute (Law), one which operates to make criminal or punishable, orin any way expressly to affect, acts done prior to the passing of thelaw.

[Sarah]

a [commoner] of the second-hand lifestyle not limited to or apart from [thrift] stores,used [CDs] tapes and especially 12 vinyl; also close corellation with founders of fly.

retro active

[Oralee]

(especially of legislation) taking effect from a date in the past.