  We consider the problem of entanglement detection in the presence of faulty,
potentially malicious detectors. A common - and, as of yet, the only - approach
to this problem is to perform a Bell test in order to identify nonlocality of
the measured entangled state. However, there are two significant drawbacks in
this approach: the requirement to exceed a critical, and often high, detection
efficiency, and much lower noise tolerance. In this paper, we propose an
alternative approach to this problem, which is resilient to the detection
loophole and is based on the standard tool of entanglement witness. We discuss
how the two main techniques to detection losses, namely the discard and
assignment strategies, apply to entanglement witnessing. We demonstrate using
the example of a two-qubit Bell state that the critical detection efficiency
can be significantly reduced compared to the Bell test approach.
