Why synthetics are deadlier than heroin, in a single photo

The opioid crisis keeps getting worse because of synthetics like fentanyl and carfentanil, which are many times more potent and dangerous than heroin.
The photograph above was taken at the New Hampshire State Police Forensic Laboratory to show the size dose needed to kill an average-sized adult male. On the left is a lethal dose of heroin, about 30 milligrams; in the middle is a lethal dose of fentanyl, about 3-milligrams; and on the right a lethal dose of carfentanil, about 20 micrograms, or the size of a snowflake.
The Centers for Disease Control and Prevention says fentanyl is up to 100 times more potent than morphine and many times that of heroin. Carfentanil is 100 times more potent than fentanyl, and 5,000 times more potent than heroin. All three substances look alike, and drug users often don't know how potent their dose is. Tim Pifer, the director of the New Hampshire State Police Forensic Laboratory, said it was like "injecting yourself with a loaded gun.”
Fentanyl is used as an anesthetic and for relieving pain, and is safe when administered by trained professionals using laboratory-grade equipment. Carfentanil is intended for large-animal use only, as its extreme potency makes it inappropriate for use in humans, according to the National Institutes of Health.
Source: New Hampshire State Police Forensic Laboratory: nh.gov