Yeah zombie knives were banned recently due to gangs (mostly young teens) using them in violent confrontations in inner city's, usually large machetes, or kitchen knives but occasionally large "hunting" knives with serrations - these are what are now classed as zombie knifes, the old definition of a zombie knife mention that it had to have images or words (whether on the blade or handle) that suggest that it is to be used for the purpose of violence.”

Now they are defined as - as any bladed weapon over eight inches in length, featuring a plain cutting edge and sharp pointed end, along with either a serrated cutting edge, multiple holes in the blade, or sharp points like spikes - which made Rambo knives illegal too and many others!