  We report on the observation of suppression and revival of coherent
backscattering of ultra-cold atoms launched in an optical disorder and
submitted to a short dephasing pulse, as proposed in a recent paper of T.
Micklitz \textit{et al.} [arXiv:1406.6915]. This observation, in a quasi-2D
geometry, demonstrates a novel and general method to study weak localization by
manipulating time reversal symmetry in disordered systems. In future
experiments, this scheme could be extended to investigate higher order
localization processes at the heart of Anderson (strong) localization.
