Just-retired ICC match referee David Boon says ball tampering and security issues were the biggest challenges that he found "confronting" during his 14-year tenure in the position. Boon officiated in 87 Tests, 183 ODIs and 119 T20Is in the men's game and seven women's T20Is. The 64-year-old former Australia opener, who will join Cricket Australia (CA) as director to continue his long-standing association with the sport, looked back at the joys and challenges of officiating in international matches. "I think there are challenges that you have to meet everyday. You learn something everyday. I suppose there are certain things that are a bit more confronting, I found.