  In this paper we consider the fact that the simple criterion used to label
fast radio transient events as either fast radio bursts (FRBs, thought to be
extragalactic with as yet unknown progenitors) or rotating radio transients
(RRATs, thought to be Galactic neutron stars) is uncertain. We identify single
pulse events reported in the literature which have never been seen to repeat,
and which have been labelled as RRATs, but are potentially mis-labelled FRBs.
We examine the probability that such `grey area' events are within the Milky
Way. The uncertainty in the RRAT/FRB labelling criterion, as well as
Galactic-latitude dependent reporting bias may be contributing to the observed
latitude dependence of the FRB rate, in addition to effects such as Eddington
bias due to scintillation.
