“The authors have underestimated … of false-positives from pseudoephedrine ingestion with … Microgenics (Fremont, CA ) cloned enzyme donor immunoassay (CEDIA) for amphetamine and Ecstasy due to a high cross-reactive threshold (pseudoephedrine concentration … 160,000 ng/ml), citing a mean pseudoephedrine concentration in fatal overdoses of 105,000 ng/ml.”