Final answer:
Marijuana is the most detected drug after alcohol in arrests and collisions, with around 1.5 million people being arrested each year. The consumption of marijuana remains widespread.
Step-by-step explanation:
The most detected drug after alcohol in arrests and collisions is marijuana. According to FBI data, marijuana-related offenses are the most numerous of drug abuse violations, with around 1.5 million people being arrested each year. While the manufacture of marijuana has fallen due to legalization and decriminalization, the consumption of marijuana remains widespread and leads to a high detection rate.