Hello Everyone! I have been watching and listening with interest to all the various educated guesses with regard to this trial.
Just a thought .... Suppose there was quite a lot of blood that happened to fill up the toilet (under 2 gallons) Is there not then a type of siphon effect that lowers the water in the toilet?
See below
http://web.mit.edu/2.972/www/reports/toilet/toilet.html
Example of A Simple Siphon
Siphoning is used in transporting a fluid from a reservoir of higher elevation to one of lower elevation. Bernoullis equation (shown below) can help explain this type of fluid transport.
The siphon for a toilet is an upside down "U" shaped tube that connects the bowl (higher reservoir) to the sewer/cespool (lower reservoir).
If fluid (anything under approximately 2 gallons) is added to the toilet bowl itself, notice that the water level does not change. The extra fluid will cause the water level in the bowl to rise slightly for a moment, but then that extra water overflows into the siphon tube, passes through the tube, and out of the system (but this does not cause the toilet to flush).
When the toilet is flushed, 2 gallons of water rush quickly through the bowl, causing the siphon tube to fill up completely, resulting in a change in pressure (lower pressure inside the tube ahead of the flowing water, and higher pressure in the water (at the inlet of the siphon) in the bowl. Once all the water has passed through the tube, air enters and interrupts the siphoning process (causing the gurgle you hear after you flush). Then water in the bowl is replenished when the inlet valve in the tank allows more water to come in through the supply line.
BBM