feeding question

[Gluttony]

I defrost their prey, and put all the snakes in their totes, then I feed them all in one shot, while they eat I change out their water dishes and spot clean or break down the entire cage if needed. When I am done, since the totes are clear I examine them ,which I do before they go in the tote anyway & then I put them back in their enclosures.( as carefully as holding a newborn)
As for them ingesting substrate...I would rather not risk them eating ANY at all, since getting impacted CAN kill smaller snakes. Imagine eating your food whole with pieces of bark or particulate fecal matter stuck to it, I am positive this would cause you some discomfort, so why should it be okay for the snake.
99 percent of my snakes are neither cage aggressive nor are they aggressive after their meal.. I have never been bitten while tote feeding, I have however been bitten while cage feeding.