  Gamma-ray burst afterglow observations in the Swift era have a perceived lack
of achromatic jet breaks compared to the BeppoSAX, or pre-Swift era.
Specifically, relatively few breaks, consistent with jet breaks, are observed
in the X-ray light curves of these bursts. If these breaks are truly missing,
it has serious consequences for the interpretation of GRB jet collimation and
energy requirements, and the use of GRBs as cosmological tools. Here we address
the issue of X-ray breaks that are possibly `hidden' and hence the light curves
are misinterpreted as being single power laws. We do so by synthesising XRT
light curves and fitting both single and broken power laws, and comparing the
relative goodness of each fit via Monte Carlo analysis. Even with the well
sampled light curves of the Swift era, these breaks may be left misidentified,
hence caution is required when making definite statements on the absence of
achromatic breaks.
