BitLocker provides for a recovery key. This is to allow someone to regain access to an encrypted device in the event that they lose their PIN, any one of these scenarios happen, OR when suspects do not want to cooperate with LEOs.
Find your BitLocker recovery key
If the target device is part of an enterprise and managed with EntraId/Intune this is the option. Escrowed keys.
Except that Microsoft basically puts a gun to every users head to login with a Microsoft account which can/does backup the recovery keys.