I've heard this one a lot. My experience has been that this can be the case when feeding live chicken. I have not found this to be the case when feeding FT. I don't know why that would be. I feed FT chicken somewhat regularly to carpet and sumatran short tail pythons and I've noticed no difference in the consistency of the poop. Maybe because they still eat primarily rats/rabbits. Chicken probably makes up about 20% of their diet.