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depends, usually it takes a month but my father was in the army and he said that they picked it up in his system from six months ago but its unlikely that would happen. hope this helps

billy the bong

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11y ago
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9y ago

A blood test can detect marijuana for a limited period of time with a maximum of 24 hours. However, other tests like the urine test can detect marijuana for up to 14 days.

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11y ago

Three month's.....it stays in your hair follicles.

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Q: How long does marijuana take to get out of your system for a blood test?
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