From Footprints in the Sand to the Locard Principle

Posted by martin.parnell |
From Footprints in the Sand to the Locard Principle

In forensic science Locard's exchange principle (sometimes simply Locard's principle) holds that the perpetrator of a crime will bring something into the crime scene and leave with something from it, and that both can be used as forensic science Dr. Edmond Locard (13 December 1877 – 4 May 1966) was a pioneer in forensic science who became known as the Sherlock Holmes of France. He formulated the basic principle of forensic science as: "Every contact leaves a trace".

Paul L. Kirk expressed the principle as follows:

"Wherever he steps, whatever he touches, whatever he leaves, even unconsciously, will serve as a silent witness against him. Not only his fingerprints or his footprints, but his hair, the fibres from his clothes, the glass he breaks, the tool mark he leaves, the paint he scratches, the blood or semen he deposits or collects. All of these and more, bear mute witness against him. This is evidence that does not forget. It is not confused by the excitement of the moment. It is not absent because human witnesses are. It is factual evidence. Physical evidence cannot be wrong, it cannot perjure itself, and it cannot be wholly absent. Only human failure to find it, study and understand it, can diminish its value."

It’s an interesting concept, that everywhere we go, when we leave, we take something and leave something behind. It got me thinking about how this applies, in our everyday lives.

When it comes to leaving things behind, there are the tangible things, like a strand of hair or a thread from an article of clothing, but what about the things that are more fleeting, like a smile, a comment or a frown?

These, too, can leave their mark and yet, like that fingerprint on a glass, we may not even notice. However, we know how they can affect us, how we sometimes take them with us and recall them, later.

Take a few minutes and think about, what you might have left behind today.

Did you give a good piece of advice? Did you praise someone or pay them a compliment? Did you say something that may have hurt someone’s feeling? Did you make a positive contribution in the workplace? Also, what have you taken with you, when you left home this morning or your place of work, at the end of the day? Did someone make you smile? Did you learn something new? Did you meet someone who made a lasting impression?

All of these things work both ways. Sometimes, it’s up to you what you might take away or leave behind.

When I walk on the beach, I like to see my footprints in the wet sand. But we don’t need the seashore to make an impression. Someone will follow in your footprints, either at home or at work.

Just make sure the ones you leave behind leave a positive imprint.

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