probative

1. (law) Tending to prove a particular proposition or to persuade someone of the truth of an allegation.Examples: "The judge had granted the DA a one-week extension with the caustic admonition that the case would be summarily dismissed if at that time probative, as opposed to prejudicial, evidence was not produced."; "My grandfather in person organized the file with a surfeit of sworn testimonies and probative documents […]"