no, rigged by the FAA
Horizon level indicators are easy to make
They have been using them for Thousands of Years (the Egyptians had them).
Eg:
1) Hang the plum-bob
2) Use one edge of one right angle measure against the string of one plum-bob
You now know the horizon.
Another is a spirit level that you can get from any hardware store. More accurate ones tend to be a bit more complex, but with even basic knowledge you can usually check for tampering or even build one yourself.