I guess drug testing and follow through isn't/wasn't that important to tennis.
In the first excerpt Agassi writes about taking the drug at home with an assistant known only as Slim:
"Slim is stressed too ... He says, You want to get high with me? On what? Gack. What the hell's gack? Crystal meth. Why do they call it gack? Because that's the sound you make when you're high ... Make you feel like Superman, dude.
"As if they're coming out of someone else's mouth, I hear these words: You know what? F*** it. Yeah. Let's get high.
"Slim dumps a small pile of powder on the coffee table. He cuts it, snorts it. He cuts it again. I snort some. I ease back on the couch and consider the Rubicon I've just crossed.
"There is a moment of regret, followed by vast sadness. Then comes a tidal wave of euphoria that sweeps away every negative thought in my head. I've never felt so alive, so hopeful - and I've never felt such energy.
"I'm seized by a desperate desire to clean. I go tearing around my house, cleaning it from top to bottom. I dust the furniture. I scour the tub. I make the beds."
Later on, Agassi writes, he received a call from ATP doctors telling him he'd tested positive for meth.
"My name, my career, everything is now on the line. Whatever I've achieved, whatever I've worked for, might soon mean nothing. Days later I sit in a hard-backed chair, a legal pad in my lap, and write a letter to the ATP. It's filled with lies interwoven with bits of truth.
"I say Slim, whom I've since fired, is a known drug user, and that he often spikes his sodas with meth - which is true. Then I come to the central lie of the letter. I say that recently I drank accidentally from one of Slim's spiked sodas, unwittingly ingesting his drugs. I ask for understanding and leniency and hastily sign it: sincerely.
"I feel ashamed, of course. I promise myself that this lie is the end of it."
The ATP accepted Agassi's version of events and he received no drug suspension.