What is the author's perspective in the memoir, Marching Powder: A True Story of Friendship, Cocaine, and South America’s Strangest Jail?

As the book begins, Thomas already has been a drug trafficker for a number of years. He is clearly proud of his ability to stay calm under the threat of being detected and he has a high opinion of his smuggling skills. He also regards himself as unusually personable and likeable. He displays no sense of shame or even of ambivalence about activities that certainly have done damage to others. This is the perspective of someone with the tendencies of a sociopath, a man with an impaired conscience.