For the past eleven years Nathan has been a criminal law practitioner who focuses on impaired-driving matters. Most recently he has taken on the additional role of standing agent for the Public Prosecution Service of Canada in Peterborough, prosecuting matters under the Controlled Drugs and Substances Act in addition to his private practice. Since 2012, he has produced the Drug Recognition Exercise/Standardized Field Sobriety Testing Netletter for practitioners, to keep them abreast of developments related to drug-impaired driving. He has developed and presented a day-long CPD course in consultation with DRE officers. In 2015, he was a panel member on the Law Society of Upper Canada’s annual Drinking and Driving CPD and authored the paper provided to participants for the panel. Nathan has received training to conduct SFST and DRE training at seminars in Atlanta and New Orleans in 2014 and 2016, as well as completing the NCDD Mastering Scientific Evidence Course.