  The past of the photon in a nested Mach-Zehnder interferometer with an
inserted Dove prism is analyzed. It is argued that the Dove prism does not
change the past of the photon. Alonso and Jordan correctly point out that an
experiment by Danan et al. demonstrating the past of the photon in nested
interferometer will show different results when the Dove prism is inserted. The
reason, however, is not that the past is changed, but that the experimental
demonstration becomes incorrect. The explanation of a signal from the place in
which the photon was (almost) not present is given. Bohmian trajectory of the
photon is specified.
