There’s no twitching.

No scratching. No blinking. Definitely no breathing. Schenck practiced holding his breath for 30 seconds at a time, then realized he could arch his back to create a small space between the table surface and his ribs. So if he absolutely needed air, at least his whole body wouldn’t move up and down.

Source:
http://blogs.laweekly.com/stylecouncil/2011/12/justin_schenck_csi_crime_scene.php

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