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John Travis has more than 20 years of experience as an analytical chemist specializing in the analysis of dietary supplements. As Senior Research Scientist at NSF International, Travis analyzes hundreds of dietary supplement products each year for various contaminants, emerging drugs and harmful compounds. Travis is also a subject matter expert on athletic banned substances and was instrumental in the development of the screening methods used for the NSF International Certified for Sport® program, which now screens products for more than 265 athletically banned substances.