Cognitive Scaffold

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MENTAL MODEL · M2324

Locard's Exchange Principle

Locard's Exchange Principle
TechnicalHigh supportMedicine
Included
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Version 1.0.0 · Updated 2026-07-30

CORE DEFINITION

"Every contact leaves a trace." The criminal will inevitably take something from the scene (such as dust) and leave something behind (such as hair). -

SCAFFOLDING EFFECT

psychology

Reduce cognitive load

A privacy warning in the digital age. - In the Internet age, this principle has been upgraded to the "Digital Locard's Principle." Every webpage you browse, every like you click, every second you stay, you "exchange" with the server, leaving data traces (Digital Exhaust). In this world, there is no

anchor

Anchor fast decisions

Every contact results in an exchange of trace evidence; the two parties in contact inevitably exchange materials.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Locard%27s_exchange_principleZH · Explicit
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