no, that is not Rav Kanievsky checking someone's aravos. Yes, that is Rav Kanievsky checking out someone's marijuana.
Rav Yitzchak Zilbershtein issued a psak that medical marijuana is kosher for Pesach and are kitniyos-free, after he inspected it and the growing process and ensuring that there are no grains mixed in with the leaves...
Rav Zilbershtein then brought it to Rav Kanievsky who smelled it and made a bracha (borei minei besamim) after being told that smelling it helps to heal.
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