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Why didn't Canelo and GBP agree to have hair samples checked? NSAC should check Canelo's hair sample for abuse of Clenbuterol. Hair sample can trace Clenuterol abuse 6 months back [1]. The hair test will show up everything that an athlete has done during the hairs growth. LOL, I would not be surprised if Canelo comes to the NSAC hearing shaved 
DD
Latest state-of-the-art hair screening techniques for Clenbuterol can detect very fine amounts of metabolites of Clenbuterol that are retained in the hair shaft. They can actually get a timeline of what and when things were taken, as well as relative doses [2-4].
[1] Machnik M, Geyer H, Horning S, Breidbach A, Delahaut P, Schänzer W, "Long-term detection of clenbuterol in human scalp hair by gas chromatography-high-resolution mass spectrometry", J Chromatogr B Biomed Sci Appl., 723(1-2):147-55, 1999.
[2] Kintz P, "A new series of hair test results involving anabolic steroids", Toxicologie Analytique et Clinique, 29(3):320-324, 2017.
[3] Parr MK, et al. "Distinction of clenbuterol intake from drug or contaminated food of animal origin in a controlled administration trial – the potential of enantiomeric separation for doping control analysis", Journal
Food Additives & Contaminants: Part A, Vol. 34, pp. 525-535, 2016.
[4] Odoardi S, et. al. "High-throughput screening for drugs of abuse and pharmaceutical drugs in hair by liquid-chromatography-high resolution mass spectrometry (LC-HRMS)", Vol. 133, pp. 302-310, 2017.
DDLatest state-of-the-art hair screening techniques for Clenbuterol can detect very fine amounts of metabolites of Clenbuterol that are retained in the hair shaft. They can actually get a timeline of what and when things were taken, as well as relative doses [2-4].
[1] Machnik M, Geyer H, Horning S, Breidbach A, Delahaut P, Schänzer W, "Long-term detection of clenbuterol in human scalp hair by gas chromatography-high-resolution mass spectrometry", J Chromatogr B Biomed Sci Appl., 723(1-2):147-55, 1999.
[2] Kintz P, "A new series of hair test results involving anabolic steroids", Toxicologie Analytique et Clinique, 29(3):320-324, 2017.
[3] Parr MK, et al. "Distinction of clenbuterol intake from drug or contaminated food of animal origin in a controlled administration trial – the potential of enantiomeric separation for doping control analysis", Journal
Food Additives & Contaminants: Part A, Vol. 34, pp. 525-535, 2016.
[4] Odoardi S, et. al. "High-throughput screening for drugs of abuse and pharmaceutical drugs in hair by liquid-chromatography-high resolution mass spectrometry (LC-HRMS)", Vol. 133, pp. 302-310, 2017.
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