Law terminology (riddles)

I stir the calm, make tempers rise, I fill the streets with angry cries. I push for change, I fan the flame, Without my spark, protests seem tame.

I bring the end, I close the fight, With just one word, wrong turns to right. The jury speaks, the judge agrees, And with my weight, the law decrees.

A tiny print, a hidden clue, With ridges swirled in lines so true. No two alike, a match will show, Who touched the scene? Now we will know.

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