Current FMCSA Random testing requirements regarding how many random tests must be done in a calendar year are 50% for drugs and 10% for alcohol.
If your drivers are in a consortium pool for Random selections, the group needs to meet the minimum testing requirements for drugs and alcohol. All you need to do to be in compliance with your Random requirement is to send your employees in for testing when you receive a Random selection.
If your drivers are in a company pool, then you will need at least 8 drivers random tested for drugs and 2 for alcohol to meet the 50% and 10% requirements.