The instructor must be an individual who has done one of the following:
1. Has demonstrated the necessary knowledge, skills and abilities by regularly performing DOT tests for at least a year,
2. Has conducted BAT training for at least a year,
3. Has successfully completed a Train the Trainer course.

Remember that the above requirements mean that the individual has the experience on the same instrument on which they will be training.

Before contracting with a service provider for training, you should educate yourself about the training requirements of DOT.  A summary of the DOT training requirements can be downloaded here.