During a motion hearing, the judge will often ask to see a case that supports the position you're arguing. Be sure to come prepared. Since you can't always predict which particular issue will be troubling to the judge, you might have to bring copies of several cases, some of which are only tangentially related to your main points.
Should you make "clean" copies of these cases for the judge? I don't think so. I prefer to hand the judge my copy--that is, the one for which I've taken the time to highlight all the best language. When the argument ends, that's the copy I magnanimously suggest the judge keep with the file if he or she decides to take the motion under advisement.
Perhaps you're worried that in handing over your copy of a case, you might be left empty-handed if the judge has questions about it during the argument. This isn't a problem if you remember to arrive at court with two identical sets of highlighted cases. When the judge takes your first copy, you can pull out the second for yourself.
Does all this work seem like overkill? It won't the next time your great case (undoubtedly the one you thought didn't matter) persuades the judge to rule in your favor.