adds some helper procs

code/game/objects/items/weapons/handcuffs.dm

@@ -29,7 +29,7 @@
 
 	if(ishuman(C))
 		var/mob/living/carbon/human/H = C
-		if(!(H.get_organ("l_hand") || H.get_organ("r_hand")))
+		if(!H.has_left_hand() || !H.has_right_hand())
 			to_chat(user, "<span class='warning'>How do you suggest handcuffing someone with no hands?</span>")
 			return
 

code/game/objects/items/weapons/legcuffs.dm

@@ -127,7 +127,7 @@
 					H.apply_damage(trap_damage, BRUTE,"chest")
 				else
 					H.apply_damage(trap_damage, BRUTE,(pick("l_leg", "r_leg")))
-				if(!H.legcuffed) //beartrap can't cuff you leg if there's already a beartrap or legcuffs.
+				if(!H.legcuffed && H.get_num_legs() >= 2) //beartrap can't cuff you leg if there's already a beartrap or legcuffs.
 					H.legcuffed = src
 					forceMove(H)
 					H.update_inv_legcuffed()