It is possible that they could dig up this person to testify against you. The program you speak of is to make sure you are not using drugs now and in the future. The charges you speak of were dropped, so it seems pretty clear that this person is not credible. If you suspect any problems to ensue from that, you should hire an attorney. Also, if you were arrested without probable cause, and the charges were dropped, you may have the ability to sue the police for false arrest. Your time may be running out to file a claim very soon.
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The DHSMV is an administrative agency which is not bound to the same rules regulations as the court system. In my opinion, it is unlikely that they would consider a third party's allegations of drug and alcohol abuse given the circumstances. That being said, I suggest contacting an attorney in your area to help you fully address this issue.
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