another shocking revelation

The Government Accountability Office on Tuesday released a report documenting what many special-needs advocates say they have known, or at least strongly suspected, for years: that charter schools tend to serve lower populations of students with disabilities than do traditional public schools. Some of the takeaways from the report—see our full story for more details—come from looking not only at the overall picture, but from a more detailed dissection of where the largest populations of special-needs students tend to be clustered.

-- Ed Week

From my own experience, I absolutely see how this might happen. It's an unspoken thing. No evidence, no proof.