Is it legal to buy a mouse but to feed it ALIVE to your pet tarantula?

There are many videos on youtube of this happening and it is absolutely sickening. I feel sick after watching every video. Is this even legal? People basically put their tarantula in a container and then feed the mouse to it, and people watch the tarantula kill the mouse with blood and everything. where is this behaviour illegal and can the owner(s) be prosecuted?