This is no less non-nonsensical than how Holmes solved crimes in the novels.
"I can tell from your gait that you are a taxidermist. From the red smudge on your lapel, I see you have been to Cornwall lately. Your favorite book is "Bawdy Maids in Estrus", as evidenced by the fact that you are left handed. By eliminating the impossible, the remaining truth present itself, that you are the real killer!"
When I was a kid I read the second half of the Sherlock Holmes "Canon" and came to the conclusion that Sherlock (and his brother Mycroft) were both andriods sent to us by a superior alien race to assist the British government in the time between WWI and WWII. The book report was not well received.