In forensic science, Locard’s Exchange Principle says that the bad guy will unintentionally bring something physical into a crime scene and leave the same with something from it.
If you take this a bit further, and outside the realm of criminal investigation, it stands to reason that we can leave behind in our daily wake, emotional imprints on our environments and the people we know. Likewise, we take bits and pieces of the people and our environments with us when we come and go.
The difference is that with emotions, we have a choice between leaving negative energy or positive.
The Old Blog in the Desert 
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