Our county has a rubric that includes testing, which they administer, achievement in school, teacher write up, parent write up, including achievement out of school. So it is pretty thorough.
It does seem to take some wrangling to have a school focus on achievement outside of school, especially if it is info coming from a parent, but they do seem to take all that into account if one is willing to keep bringing it to their attention. The time frame for identification is glacial.