Corrected entry: We find out in the movie that Detective Tapp loses his job and goes insane trying to find the killer after his partner dies during the Warehouse shoot out that occurred with Jigsaw. Lawrence explains that Detective Tapp started stalking him thinking that Lawrence was Jigsaw and due to this, Adam was even hired to take photos of Lawrence. At the very end of the movie, when we discover the true identity of the Jigsaw killer, a montage of clips are shown, including one from the warehouse scene showing Jigsaw's face visible behind his robe. Since Detective Tapp would have easily seen his face when attempting to arrest Jigsaw, he would have known for sure that Lawrence wasn't in fact the Jigsaw killer.
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Correction: The montage is taking place from a different perspective. We saw the whole warehouse scene, and could tell that Jigsaw's face wasn't visible during any of it. They only showed it during the montage because you now knew who was behind it, and they were just showing it from a new, enlightened perspective.