First drug-checking study at an electronic festival and fentanyl detection in the central region of Mexico.

Harm Reduct J · 2023 · PMC10698886 · PMID 38053148

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did not reach statistical significanceno p-value reported

Knowing that false positives can occur in concentrated MDMA samples, we analyzed if there was a correlation between fentanyl positivity and high NMDA concentration, but the result ( p = 0.167; Fisher’s exact test) did not reach statistical significance (Table 5 ).

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