They can definitely detect MDMA (ecstasy) even if it is small and hidden amount. Some criminals use masking agents like coffee but most of the dogs are trained to detect suspicious masking agents as well. The only good option for them is to use activated charcoal to absorb all the smell. Even if it works cops have molecular scanning devices which are able to recognise any composition in your bag.
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Dogs can be trained to detect the scent of ecstasy (MDMA) as part of their search for illegal drugs. Their keen sense of smell allows them to detect even trace amounts of drugs, making them valuable assets in law enforcement efforts to combat drug trafficking and use.
Sniffer dogs are used all over the world to detect hidden items. Police use them to help catch criminals. The dogs sniffs something belonging to the criminal then tries to find something with the same scent. Other types of sniffer dogs work at airports and detect if someone is carrying drugs or weapons on them. Some food is also illegal and airport sniffer dogs can find them as well. The most popular breed for sniffer dogs are beagles, Golden Retrivers, Labrdors and German Shepards
Dogs have a strong sense of smell and may be able to detect the scent of marijuana on a person's body, including their buttocks. However, it would depend on the specific circumstances, such as how recently the marijuana was used and how well it was concealed.
Dogs have fewer color-detecting cells in their eyes compared to humans, so they perceive the world in shades of gray. This lack of color vision is due to the types of cones in their eyes - they have more rods (which detect light intensity) and fewer cones (which detect color) than humans.
Dogs generally have better hearing than cats, as they have a wider range of frequencies they can detect. Dogs also have a more acute sense of hearing due to the shape of their ear canals. Cats have good hearing as well, but dogs are typically more sensitive to sounds from a farther distance.
No, a dog's sense of smell is much stronger than an ant's sense of smell. Dogs have an estimated 220 million olfactory receptors compared to an ant's few hundred. This allows dogs to detect scents at incredibly low concentrations and with great accuracy.