In order to be compliant with the various state and federal laws and protect yourself, stockholders, employees, and customers/patients, you should protect all confidential and outdated material.

    Any document, which contains confidential material (designs, proposals, plans, and drafts of such information.).

    Any document which could be used for the purpose of identity theft (social security numbers, customer lists, credit applications, tax returns, etc).

    Any document which could cause harm in the hands of criminals or competitors (canceled checks, price lists, business plans, credit card numbers)

    Any document which is mandated to be protected by your state laws or the federal laws such as HIPAA (medical), GRAMM LEACH BLILEY (financial) and FACTA (personal credit) records.

Click on these links to learn more about each of the governing laws. However, at this time, there are much more severe laws enacted at the state level.
HIPAA HIPAA
GLB GLB
FACTA FACTA