You can use below script to get bitlocker status in disk drives,
BitLocker (codenamed Cornerstone and formerly known as Secure Startup) is a full disk encryption feature included with select editions of Windows Vista and later. BitLocker can encrypt the drive in which your Windows operarting system is installed and also fixed data drives (such as internal hard drives). Bitlocker can encrypt your external flash drives and protect them as well.
please run the script as SYSTEM USER and LOGGEDINUSER