Sept. 4, 2008 Opinion
https://www.eff.org/files/2015/03/02/fisc_opinion_and_order_september_4_2008.pdf
I believe on page 11 - Review of Targeting and Minimization Procedures, is an interesting place to start. This doc is less redacted and is referenced on the Collyer doc on page 11 as well.
https://www.dni.gov/files/documents/icotr/51117/2016_Cert_FISC_Memo_Opin_Order_Apr_2017.pdf