One of the funniest oneliners I've seen in a technical paper: " It is therefore impossible to have a Laser deliver more than about a GigaJoule of coherent light. The implied limitations to military systems, such as those inspired by SDI, are so tragic they shouldn’t even be contemplated. " http://arxiv.org/gr-qc/0603073 Bee Hossenfelder was one of the people thanked in the acknowledgments of this paper, so maybe she can give us some extra insight. Magueijo has come up with something that could be TESTED and which is derivable from some forms of (Loop) quantum gravity that require DSR. It is a limit on the amount of energy you can stuff into a coherent laser pulse. This could presumably be used to FALSIFY those forms of DSR-LQG which imply this energy limit. That seems like it might be helpful. And also quite intriguing if they PASSED the test----meaning that this limit exists. The oneliner I quoted is on page 10, one paragraph from the end of the article, in the conclusions.