Pretty sure You can use an a Electronic Caller,I'm using a FoxPro Shockwave Caller on Public Land and I also pack several mouth calls to add a little extra realism to my Calling and I case of the batteries going dead?You can check the Regulations for different Areas in Missouri by going to out State Site of mdc.mo.gov !

Good Luck,Be Safe and have a good time chasing those Predators!