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Thai) 1: 
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Urine, as a specimen for drug testing, has some limitations including
ease of dilution, substitution and adulteration aswell as poor correlation
between drug concentration and severity of impairment. On the other
hand, oral fluid is easy to collect/handle and can be obtained under close
supervision to prevent adulteration or substitution of samples [3]. The
detection of MA and Δ9-tetrahydrocannabinol (THC) in oral fluid can
provide better indication of recent use than those in urine or hair.
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