It's 8pm on a Friday night this year, he's home alone in the sanctuary of his bedroom and he tells himself that this is his reward for finishing his exams except for business studies, which he doesn't care about. Within moments, the year-old's heart rate goes up, butterflies flutter in his stomach and waves of colour dance across his field of vision, regardless of whether he closes or opens his eyes. This is the fifth time he's taken the hallucinogen, the first four with no unpleasant side effects, so he's trying a double dose to see whether the sensations become more intense. He cuts a tiny sliver from one of the tabs and drops it into a glass tube containing a small amount of liquid. He watches as the sample reacts to the chemicals, turning dark purple, indicating its purity. Satisfied, Tom eats four tiny pieces of LSD-soaked blotting paper known as "tabs".