  A `quantum inequality' (a conjectured relation between the energy density of
a free quantum field and the time during which this density is observed) has
recently been used to rule out some of the macroscopic wormholes and warp
drives. I discuss the possibility of generalizing that result to other similar
spacetimes and first show that the problem amounts to verification of a
slightly different inequality. This new inequality \emph{can} replace the
original one, if an additional assumption (concerning homogeneity of the
`exotic matter' distribution) is made, and \emph{must} replace it if the
assumption is relaxed. Then by an explicit example I show that the `new'
inequality breaks down even in a simplest case (a free field in a simply
connected two dimensional space). Which suggests that there is no grounds today
to consider such spacetimes `unphysical'.
