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Yes, it can be done, but there are a few things to check.
First, and very important, did the owner ever medicate the tank with copper or similar medication? If they did, during the treatment the LR absorbed a lot of copper. The live rock will leach copper for years afterward. If this is the case, it's best to discard the LR or use it for a FO system.
If the LR is over grown with a lot of problem algae, the rock may have absorbed a lot of phosphate or nitrate. This can be delt with, but it can take a long time.
The procedure is the same as when the rock was originally cured. Place it in a large container with a lot of circulation, and the water heated to normal temps. They wait until ammonia and nitrite have dropped to 0. This can take several weeks or more.
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