Every week, the TDN posts a roundup of the relevant Horseracing Integrity and Safety Act (HISA) related rulings from around the country. The following rulings were reported on HISA's "rulings" portal and through the Horseracing Integrity and Welfare Unit's (HIWU) "pending" and "resolved" cases portals. Among this week's rulings, trainer Luis Diaz has been banned a combined 18-years and fined a combined $225,000 for possession of prohibited substances. According to HIWU's final written decision, HIWU investigators searched Diaz's barn and vehicle at Turf Paradise, Arizona, on January 21. They found...