A few steps
Whole house
The paper
Louisiana accepts a statement written at home. Fill in the blanks, print it, sign it.
The statute asks for no reason and no religion. The state's own Statement of Exemption from Immunizations form says the same thing and may be used instead.
The paper. a statement the parent writes, or the Statement of Exemption from Immunizations. There is no state form to fill in. It does not expire.
This is a summary of public law, not legal advice. Requirements change, so always confirm with your state before you file.