A study published in the Journal of the American Medical Association showed that postal workers who tested positive for drug use in a pre-employment urine test were at least 50 percent more likely to be.

fired, injured, disciplined, or absent than those who tested negative.

Explanation:

The study showed that more than 50% of those that tested positive for drug use are fired, injured, disciplined, or absent than people who tested negative.

This indicates that there is a positive correlation between being positive and the observed occurrences. These can be attributed to the individuals that were tested, drug use brings out characteristics that lead to being fired, injured, disciplined, or absent.

It could also be that employers are victimising those that test positive for drug use.

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