Looking for a tenant

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I currently have a apartment ready for rent. I have a property manager managing the property. I would like a section 8 tenant for this property so I want to market it on the section 8 website exclusively. I was told that this might violate fair housing laws. My question is why, if this is true , can't I decide where to market my property. Why am I obligated to put the property out on the market for any tenant. Thanks in advance