  The purpose of this paper is to show that the composite photon theory
measures up well against the Standard Model's elementary photon theory. This is
done by comparing the two theories area by area. Although the predictions of
quantum electrodynamics are in excellent agreement with experiment (as in the
anomalous magnetic moment of the electron), there are some problems, such as
the difficulty in describing the electromagnetic field with the four-component
vector potential because the photon has only two polarization states. In most
areas the two theories give similar results, so it is impossible to rule out
the composite photon theory. Pryce's arguments in 1938 against a composite
photon theory are shown to be invalid or irrelevant. Recently, it has been
realized that in the composite theory the antiphoton does not interact with
matter because it is formed of a neutrino and an antineutrino with the wrong
helicity. This leads to experimental tests that can determine which theory is
correct.
