Evidence of this laundry process is found in a significant “search query” result that was actually a mistake. The faulty intelligence mistake was the travel history of Michael Cohen, a long-time Trump lawyer. The FISA search turned up a Michael Cohen traveling to Prague. It was the wrong Michael Cohen. However, that mistaken result was passed on to Chris Steele and it made its way into the dossier. Absent of a FISA search, there’s no other way Christopher Steele could identify a mistaken “Michael Cohen” traveling to Prague from the Russian sources he claimed to have used for that specific point.
The Cohen mistake created a trail from Chris Steele to the FISA database.