Since the Bank Secrecy Act of 1973 requires your bank to microfilm all of your checks and hold these records for six years, the state can get intimate details of your life from a study of your checking account.
The rap against MRIs as a diagnostic tool for low back pain is not that the scans usually reveal nothing, or even that they're expensive, it's that they often show a lot of abnormalities in the back that may have nothing to do with the source of your pain.
MRI scans are better for imaging water containing tissue. An MRI can be better at detecting abnormalities of the spinal cord, bulging discs, small disc herniations, pinched nerves and other soft tissue problems. MRIs may also be used in cases where the X-rays are contraindicated, such as with pregnant women.