“…However, in other tests, where routine storage and analysis was reproduced, the samples showed no signicant variation, allowing collection, preparation, and transportation under the usual conditions required for its use to monitor drivers under the inuence of ethanol. These results are of great importance, since the methods described in the literature typically show no data, or have insufficient data, regarding the stability [25][26][27][28] despite being recommended by the validation guidelines for bioanalytical methods. 22,23 3.2.7 Selectivity.…”