Science lab: Blood Splatter

When we did the blood splatter lab, I thought the data was inconsigntent therefore, I think that blood splatters can't serve as evidence in a crime. You can not determine the height of the person injured by blood splatters. I find that blood splatters are not consigntent in diameter. So that shows that you can not use blood splatters to predict the height of the person injured by blood splatters. Though you could use blood type to know who you are looking for...