# Chapter 2.1.2 - CASS Validation

Source: https://developer.avalara.com/products/communications/integration-guides/dev-guide_geo_soap/geocode/cass/

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AFC Geo SaaS Pro Soap can return a Coding Accuracy Support System (CASS) certified address. CASS certification is the process of normalizing addresses to USPS Publication 28 standards and validating the address against current USPS AMS-II data. All address elements are verified as well as adding ZIP code, ZIP+4, carrier route, delivery point and barcode detail. You may be eligible for discounted postal rates if using CASS certified addresses.

#### Note

All [Florida addresses](/communications/dev-guide_geo_soap/geocode/florida-certification/) are automatically CASS validated no matter the value of `CassCertify`.

CASS Validation uses the AES MailStar CASS Certified address validation application. Set `CassCertify` to turn the validation on or off:

-   `true`: Runs the validation on the input address and populates the `CassAddress` property of the `GeocodeAddressResult` instances returned if the validation is successful
-   `false`: Validation is bypassed, unless the address is in Florida - CASS validation is always performed on [Florida addresses](/communications/dev-guide_geo_soap/geocode/florida-certification/)

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