"How do you think they even invented the Breathalyzer?" Leo ponders as he leans his right cheek over his shoulder and watches Harry struggle to roll the joint. "Like how do we know it's accurate? How can it smell?"
Harry snorts and holds up the joint to his mouth, tongue darting out to lick it shut. Leo makes eye contact with him and covers up his thirst by making a questioning face.
"So... they have these charged electrodes in them and the ethanol from the alcohol in your breath reacts with them, which reacts again I think and then that gives you the percentage of ethanol in your breath."
Leo stares at him, not really knowing what to say to that. "I didn’t expect you to give me the legit answer. How do you even know that?"
Harry shrugs, taking out a lighter. "I read."
Leo watches him
