It’s been a deadly winter on California’s slopes, but the state has no idea how bad it really is. In February alone, a 21-year-old skier was found dead on a black diamond at Northstar California. Witnesses reported another skier trailed blood down a Mammoth Mountain run. A fatal collision at Northstar followed yet another death within less than two weeks — and that’s before a catastrophic avalanche killed nine backcountry skiers near Lake Tahoe. “There’s been no indication that there are more