You can not play around with a buried Persistent Weak Layer (i.e. faceted grains or surface hoar). These types of weak layers can "persist" and cause avalanches time and time again over a long duration. They are unpredictable. Your only sane choice when dealing with these buried weak layers is to stay off of and out from underneath slopes that are 30˚ or steeper. This stuff will bite you long after you think there's nothing going on. This is the case this year here in Utah and things will continue to be dangerous for some time to come.
I wanted to re-iterate and emphasize Brett's message on PWL avalanche problems. Anecdotally, I hear and read "we didn't observe any signs of instability" often in accident reports and close calls. I think our educational message is sometimes confusing as we preach observation and looking for warning signs. This approach is very useful for other types of avalanches but not PWLs, as they will produce avalanches even when the usual indicators are not present. This season we have PWL in many snow climates that do not see them often, and I'm concerned that users in those areas are applying their typical mitigation strategies for an atypical problem. Even in CO where our users see PWLs every season, it seems like the avoidance message is not reaching everybody.
A lot of hill climbs we all play on see traffic all year and I would think that slide potential is greatly reduced when a hill is tracked up but is that always the case?
In particular, persistent weak layer avalanches are notorious for releasing unpredictably, even after the slope has been covered with tracks. This is why avalanche professionals like Brett recommend avoiding avalanche terrain when PWL problems are present. In the heuristics acronym FACETSS, the T is for tracks - don't rely on them as a sign of stability.