[Zardoz]

Ok, I could see a set of temporal laws that preculde anyone from beinging back stuff that is illegal in their time of orgin. Then you'd have to have a enforcement arm...boggles the mind.

I would also think bringing people from the past back would be a horrid idea.

But I wouldn't mind traveling 200 years into the future to see if humankind still exists.

A good unconventional time travel movies it Idaho Transfer, well worth checking out.