The longest traceable part of your body for substances would be in your hair, in which cocaine last 3 months.
LSD on your other hand was said to stay traceable in your spinal cord fluids for the rest of your life... That wasn't true. That was just a medical deterrent lie to scare people into not using it. LSD has a shorter half life than marijuana for example because LSD is water soluble while something that marijuana is fat soluble. Therefore it will absorb in your hair and remain, detectable, for months.
Now, does it stay genetically marked in the follicle or could you get rid of it by simply shaving your head a few weeks after ? IDK, I'm not a biologist.
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