I have known Charles for several years and I have learned so much from his expertise in the area of breath testing. I purchased a DMT DataMaster in 2011 and Charles understanding of the instrument and principles of breath testing is phenomenal there have been several instances where, if I didn't call Charles, my result on the case would not have been successful.
The in-depth DataMaster training I received from Chuck Rathburn has been a key to success in court. After taking the hands on breath test training from Chuck I am better able to analyze DUI breath cases from the inside out. Understanding the DataMaster better than the DA's and better than may of the State's experts has helped me get some fantastic results.