Missing energy searches have been the standard method for looking for Dark Matter (DM) at the LHC. In the last decade, much work has been done to discover models which do no rely on the standard DM freeze-out paradigm. One frequent requirement of such models is the presence of a mediator particle with feeble couplings to the DM particle. If DM is indeed explained by such a theory, then it will be invisible in direct or indirect detection searches, and a collider will be the only place to detect it. The tell-tale signature is in the production of long-lived particles (LLP) at the LHC. I will show examples of two such models and demonstrate how current LHC searches can be re-interpreted to constrain their parameter space. In particular, I will show that there is currently a gap in LLP searches that needs to be remedied and discuss ideas of how it
can be done. I will also talk about how experimentalists can ensure that their search
results are re-usable by theorists (a.k.a. re-interpretation).
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