You must have M4K3's Police Buffalo model for DFF file.
Download here:
http://www.gtainside.com/en/sanandreas/cars/65671-gta-v-bravado-buffalo-s-police-edition/

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Description:

I edited the template and replaced the SFPD badge with the
SAHP badge.

- Paintjob or TXD for M4k3's Bravado Buffalo S police edition
model.
- Has San Andreas Highway Patrol badge.
- It works with IVF.

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I am not claiming M4K3's model mine, I am just bringing you
a different livery/paintjob for you to use with his model.

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If you have questions or problems, tell me in the comments in
gtainside or email me please and sorry for my bad english.