  We study the problem of certifying quantum steering in a
detection-loophole-free manner in experimental situations that require
post-selection. We present a method to find the modified local-hidden-state
bound of steering inequalities in such a post-selected scenario. We then
present a construction of linear steering inequalities in arbitrary finite
dimension and show that they certify steering in a loophole-free manner as long
as the detection efficiencies are above the known bound below which steering
can never be demonstrated. We also show how our method extends to the scenarios
of multipartite steering and Bell nonlocality, in the general case where there
can be correlations between the losses of the different parties. In both cases
we present examples to demonstrate the techniques developed.
