Henry Andrews is the toxicology specialist of the Las Vegas Forensics Laboratory, who mainly deals with identifying toxic substances which have undergone human consumption. He has an impressive knowledge of lethal substances, including, but not limited to: illegal drugs, alcoholic beverages, poisons, and hazardous gases (such as carbon dioxide). He constantly exhibits a thorough understanding of the toxins' properties and effects. Andrews also tends to be present (to his discomfort) when his colleagues David Hodges and Wendy Simms have a "moment". In Room Service he tells Greg Sanders how much he admires him for leaving the lab behind and even asks where he gets his hair cut. In Lab Rats it was revealed that Henry used to live in Pennsylvania.