As it applies in law, circumstantial evidence is evidence that isn’t drawn from direct observation. For example, a man holding the keys to a stolen car could be circumstantial evidence if he wasn’t observed in the theft and has a reasonable explanation as to why he had the keys (e.g., he found them or they were given to him). Circumstantial evidence can be used in court and can help convict people of crimes, but the pieces of evidence must meet certain standards of proof, and thus it’s more difficult to convict someone using circumstantial evidence. Much of the evidence surrounding Charlie’s case is circumstantial because he’s infrequently seen committing his crimes and masks his administration of overdoses with moments of actual care. Collecting hard evidence to back up the circumstantial evidence is important to ensure that Charlie is incarcerated for his crimes.

A medicine that comes in tablets, capsules, and liquids, Digoxin is used to treat heart failure and arrhythmias. It assists with heart rate control and can also help alleviate heart pain and the effects of heart attack. Charlie abuses digoxin to kill his patients. For a long time, it’s one of his preferred methods of overdose, as he can easily inject it into a patient or the saline solution.