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> **Possible Duplicate:**  
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> [Why didn't the time cops try to stop Janeway when she traveled back in time to rescue Voyager?](https://scifi.stackexchange.com/questions/4767/why-didnt-the-time-cops-try-to-stop-janeway-when-she-traveled-back-in-time-to-r) 
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How come in Voyager there are many times when the ship and crew travel to a different time. Such as when they go back to LA with Captain Braxton. And when Seven is made to go back in time to stop an intruder from destroying voyager. 

Captain Braxton comes back to bring Voyager to the 24th century again. He say's it's so the timeline isn't contaminated. And when Seven is sent to save voyager it is also to save the timeline. 

However, when Admiral Janeway went back in time for the last episode of the series to bring Voyager home early, no one stopped her. 

Why would the temporal prime directive try so hard to keep the timeline as is, but during the last episode, no one tried to enforce any temporal rules?