Well, you're just wrong.It can be and has been.
Radiocarbon testing, analysis of the blood stains (which show a blood type that originated at a much later date) along with fragments of plants and rock from Palestine suggest the artefact was likely created there, as were other relics between the late thirteenth and late fourteenth centuries.
However, every one of those tests and their findings has been challenged by those who allege this artefact must have its origins in the early first century and that it was created possibly through a burst of radiation that prefigured the supposed resurrection.
So be it.