DNA testing? Actually photons don't have half integer spin, they're Bosons. Only Fermions - a particle, such as an electron, a proton, or a neutron, having half-integral spin and obeying statistical rules requiring that not more than one in a set of identical particles may occupy a particular quantum state - seem to governed by these rules. So if I put a Fermion here in the Good Ol' USA in one quantum state, instantly some other particle in Iraq has to assume a different quantum state. Interesting. Find the ones linked to a prominent politician running for the President of Iraq and tweak.