How secure is the login screen?

Hi. I run bitlocker on my system, so everytime I boot the system up, It requires bitlocker. However I often leave my computer with only the Windows login screen showing, which requires a password. If my laptop was seized by authorities for example, while the system was still on the login screen, what would they be able to do? The "Forgotten password" option on the login screen, could this be hacked? Or is there a way to access my data without even logging in? I know the safest way would be to shut down the computer everytime, so that the bitlocker passworded is needed, but its quite inconvenient.

Soldier said:

If my laptop was seized by authorities for example, while the system was still on the login screen, what would they be able to do?

I don't think it would matter much:
FBI hacks into terrorist’s iPhone without Apple

The Justice Department withdrew its legal action against Apple after a method brought to the FBI earlier this month by an unidentified entity allowed investigators to crack the security function without erasing contents of the iPhone

the FBI spent over 2 million dollars to crack the iPhone and fortunately got absolutely nothing from it since it automatically erased its contense after entering the wrong passcode numerous times. this government and law enforcement have absolutely no right to access personal files on a computer or phone. glad apple put up the fight and all the more reason I will never own any other phone but apple