Drug-detection dogs are specially trained to identify the specific smell of drugs, so they play an important role in anti-drug work. However, the situation can be complicated when it comes to whether drug-sniffing dogs can sniff out whether a person is using drugs.

First of all, the training of drug-detection dogs mainly revolves around identifying and tracking the smell of drugs. They can detect drug-related odors through their sense of smell and accurately identify drug-containing items from numerous packages or environments. However, the presence of drugs in a person's body is different from the simple smell of drugs. Drug-detecting dogs may not be able to directly determine whether a person is taking drugs through the sense of smell.

Secondly, even if a person takes drugs, the drug metabolites or odor produced in his body may quickly dissipate or change due to various factors (such as time, metabolism speed, personal hygiene habits, etc.), making It’s difficult for drug-sniffing dogs to make accurate judgments.