"preferential"? Please detail and/or reference.

[Caroline Alphonso and Kate Hammer
EDUCATION REPORTERS
February 19, 2013

Ontario school boards are struggling to hire enough male and minority teachers to reflect the diversity of their student body, making it harder for young white female teachers to find jobs.

Educators and parents were shocked at a memo circulated earlier this month from the Toronto District School Board that suggested candidates should be male, from visible minorities or aboriginal to get an interview for a full-time teaching position. However, officials at other school boards said many urban boards are implementing similar policies as part of continuing efforts to diversify a work force that has been dominated by white women for decades.[...]
https://beta.theglobeandmail.com/news/toronto/toronto-school-board-hiring-push-a-setback-for-white-women/article8863642/?ref=http://www.theglobeandmail.com&