  Loopholes present in an experimental set-up can significantly affect the
reliability of entanglement detection. We discuss two methods for detection of
entanglement: one is by using the positive partial transposition criterion
after quantum state tomography and the other by estimating the second and third
moments of partial transposition of the quantum state through random classical
snapshots. We examine the impact of inaccuracies in these detection methods by
considering presence of spurious clicks or suppression of valid clicks in the
detectors. By comparing the two methods, we observe that the condition based on
partial transposition moments is more robust to missing counts than the
positive partial transposition criteria. Moreover, we realize that in the
presence of additional counts, none of the criteria misinterpret any separable
state as entangled. But in such a scenario, the condition based on the moments
can not guarantee any state as entangled, unless the additional event
efficiency is about 0.9 or higher.
