Even though the Michigan Department of Education, Office for Special Education (or MDE) is responsible for making sure that Michigan schools follow the law, they have refused in the past to investigate complaints that point out schools' failures to use BIPs that are part of students' IEPs. Michigan Protection and Advocacy Service, Inc. (or MPAS) has tried to get MDE to change their position on this, but they have refused to reconsider. As a result, MPAS turned to the Office for Special Education Programs (or OSEP), which is a federal agency that watches over MDE and makes sure they follow the law.
In its July 16, 2015 "Letter to McWilliams", OSEP declared that MDE was wrong and said that when this kind of complaint is filed, MDE should look into whether the BIP was put into use by the school, and whether it was appropriate for the student. OSEP also confirmed that a BIP can be written into an IEP as a supplementary aid and service at any time.
A copy of the OSEP "Letter to McWilliams" is available for review here.