Drug and alcohol testing have become common practice in a variety of settings, including child custody evaluations. Parents sometimes accuse each other of not only drug use, but of suffering from addictions that impair parenting ability. Understanding the mechanics of drug testing, dispelling common myths about the (in)ability to circumvent such tests, and recognizing how drug test results can influence custody cases is crucial. Some cases merit monitoring via immediate and/or ongoing random testing, and there are instances where such demands prove unnecessary. In these cases, the accuser's actions can have significant repercussions regarding custody of minor children. It is essential to examine the role of drug and alcohol testing in custody evaluations, its implications, and the potential consequences on the parties involved.