Expert witness: Ten times, and in controlled circumstances, a single drop of the defendant' s blood was allowed to fall onto the fabric  And in all ten cases, the stained area was much less than the expected 9  5 cm2  In fact, the stained area was always between 4  5 and 4  8 cm2  I conclude that a single drop of the defendant' s blood stains much less than 9
5 cm2 of the fabric
If similar results had been found after 100 test drops of the defendant's blood, the evidence would be even stronger.