“And the motive is important, of course.” He nodded, watching traffic pass by.
“It's one of three things that help in the investigation,” I said. “The other two are opportunity and means.”
“Ah.” He nodded. He leaned again and said. “Liars are also good suspects.”
I agreed. “But how would I discern a lie, especially if I don't know someone? Or they're pretty good at it?”
“A pretty good liar has performed his art over the years and perfected it,” he said thoughtfully. “But all liars get caught at some point. One of my favorite quotes from the eminent Mr. Twain is: 'If you tell the truth, you don't have to remember anything.' ”
“That's true,” I said. In other words, a liar could be caught in a lie by not remembering what they had said about something in a prior conversation. It was how p
