Motions in Limine are pre-trial motions that serve a specific purpose. That is, they are motions designed to preview issues regarding whether certain evidence will be allowed (“admissible”) for the trial and under what circumstances it would or will be admitted. Typically, a court’s final pretrial order will set the time limit and schedule for motions in limine, but even if it doesn’t, you may want to file one.
Remember, they are filed in contemplation of trial – they are not a motion to file in some more general sense. If there is a motion for summary judgment, for example, you don’t file a motion in limine – you oppose the motion and object to the evidence in that motion. You would make all the same arguments, perhaps, but in a different context.
Remember that a court may, or may not, rule on a motion in limine before trial. The idea is to present the objection in a systematic way under conditions that allow the judge to think about it outside of the heat of the moment. It often happens that you’ll present a motion in limine and the judge won’t rule on it because the context of the trial isn’t clear until things start happening in trial. No matter. Make your best argument in the motion and argument and be prepared for whatever the judge does. Pay close attention to what the judge thinks matters regarding whether the evidence will be admitted, and be prepared to argue at trial that those conditions haven’t happened (so the evidence shouldn’t be admitted).
Finally, remember that any ruling by the judge before trial is not necessarily binding at trial. Thus, even if you lose your motion to exclude in limine, you will want to object at trial and take another shot at it. You’d be surprised how often the judge will change his mind. And that means you also have to be prepared for the other side to do the same – and you must remember that in order to preserve your rights you probably have to make your objections again at trial. So think of the motion in limine as a sort of warm up.