Illinois Children's Mental Health Act Public Act 93-0495 (SB 1951) - Mandatory Mental Health Screening
Full text can be read at: http://www2.illinois.gov/hfs/MedicalProvider/sass/Pages/930495.aspx
This has already passed here in Illinois and is law.
There is currently discussion to make it a federal law as well.
Many homeschool groups have issued detailed statements about these efforts. One of the better researched ones is by NHELD - National Home Education Legal Defense http://www.nheld.com/articles.htm#Bulletin%2037