1. secure
2. cordon
3. collect evidence
4. record and preserve evidence
* This is a summary (by Goodman) for England & Wales, 2000. Edmond Locard (1877-1966) came up with 3 rules (styled principles). They have been extended to 7 (in the United States), including separation of witnesses, but these are all really extensions of the 4 given above.
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