  We propose a scheme for quantum interrogation measurements using constructive
interference and post-selection to achieve single-pass high-efficiency
detection for imperfect or semi-transparent absorbers. We illustrate that our
method works for heralded single-photon as well as weak attenuated sources. We
also study the influence of error from our equipment and show that
post-selection renders robustness to our scheme against noise. We further
demonstrate that with a small extension, we can quantify the transmittance of
the imperfect absorber by using the process of weak value amplification (WVA)
