“The longer you work in coffee, the more when someone walks in the door you read their personality type and say, I know exactly what you're going to drink,” Jared Hamilton, a self-described “espresso wizard” at the Brooklyn-based chain Cafe Grumpy, says. When I ask him to predict my drink, he proves his skills. “What you're going to drink is like, an alternative milk, flat white or cappuccino. So maybe soy, probably almond. Nonstandard. You don't want a lot of milk, just enough.” He’s not too far off—my go-to is, in fact, a non-standard, some-milk-but-not-too-much drink, a decaf cappuccino, though I drink regular milk in it. He points to another festival visitor who is dressed in business attire. "That guy right there, he drinks espresso all day," he guesses.
Not surprisingly, no elevated risk was found in the three studies listed at bottom, which looked at urine metabolite levels rather than blood THC. This confirms that urine testing has no bearing on driving impairment. Despite this fact, US Department of Transportation regulations force millions of commercial drivers to submit to random urine testing. The government has never produced convincing scientific evidence that this policy is necessary or effective to protect public safety. But they're the government, so they don't have to provide any evidence!