Even with his blessing, the grease company could still charge you with stealing. It depends on how the grease disposal contract is written, but often the grease becomes the property of the disposal company once it is put into the dumpster. It is sort of a gray area and I have never known a grease company to get bent out of shape over a few gallons here and there. But, with the increasing popularity of WVO vehicles, some grease companies may start being more picky about it. If your friend will allow the oil to cool, then put it back into the plastic jugs it comes in it would be much better for all involved. I personally have never gotten a restaurant to do that, though, (most laugh at me when I suggest it) but my sources just put it into metal pails I provide for them.

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Keep everything as simple as possible-but no simpler--Albert Einstein