Drug and Alcohol Testing Q&A - 2008

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What targets do I use for randoms if the size of the driver pool keeps changing?

From: Safety man
Password: orange
Date: 15 May 2008
Time: 11:02:25 -0700
Remote Name: 65.119.195.2

Comments

I test drivers 4 times a year, i.e., quarterly.  I understand that I test 50% of the drivers for drugs and 10% for alcohol.  Being that I have a high fluctuation, I base my driving positions on the number of drivers eligible to be tested at the time of each selection. For example: 128 drivers X 50% leaves me with 64 drivers to test. Divide that by 4 (as we test each quarter) gives me 16 drivers to be tested for the quarter.  Correct?  For alcohol, the same 128 x 10% leaves me with 3.20. 3 drivers.  Correct? 

What happens when the size of my driver pool changes?  How do I determine how many tests must be conducted to get my 50% & 10% at the end of the year?  Is there a simple formula that I could use?