DarkRP 2.5 Pocket

On the map i use now (Zombie map) there is zombies…But players can pocket them and then release them, making the stay in the air or making zombies have kinda a “god-mode” so people have to hit a spot to kill them.
Is there a way i can disable this? Or does someone have the code to make players NOT be able to pocket them? It would’ve been great to get help, cause this is kinda a big issue for me.