"No!" April said, even more forcefully this time. "I don't think that you're a liar. A lie, per definition, is a false statement made with deliberate intent to deceive. I don't think for a moment that you made this up, or that this isn't real to you, or that you didn't see and hear exactly what you say you saw or heard." She paused, to let the words sink in, and to take a breath. "I don't think you're a liar, Abby. You're telling the truth, you saw what you say you saw. It's the reason why you saw that I want to investigate. You're a scientist, Abby! A scientist! We prove things. We gather evidence and draw conclusions and gather more evidence to support - or overthrow - those conclusions."
"Why should this be different than any case you work? You have an event, you have several probable causes for that event - how do you prove which one is right? By ruling out all the others and finding claims that support your claim."
She lowered her voice to her normal tone, hoping to get through to Abby. "How would you go about this if this was something you needed to prove for a case?"