You will always find me in the past, I can be created in the present, but the future can never taint me. What am I?

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50 Riddles & Answers [COMPLETED]
RandomDISCLAIMER: These are not mine. Includes 50 tricky riddles with answers published after every five. Good luck!
Riddle 18
You will always find me in the past, I can be created in the present, but the future can never taint me. What am I?