Yes, it <i>is</i> shooting you with a tiny bullet and sucking up the blood splash that results.  The patent calls it a &quot;micro-particle&quot;, 10µm to 250µm caliber. It can be &quot;dart-shaped&quot; or spherical.  Muzzle velocity may be supersonic. The suggested material is gold particles held together with biodegradable glue, which is a neutral material for humans.  Or maybe just a water droplet.<p>It seems they&#x27;ve tested this thing.  On Google employees?