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.
"High Priestesses Of Zardoz" By Eliza's Starbase Of Avatars Copyright 2009."
"Zardoz Speaks To You, His Choosen Trek Fans."