Yes, even ice dancers are subject to drug testing, and former European champion Ekaterina Bobrova of Russia told R-Sport (English via Google Translate) that she has tested positive for the banned substance meldonium, a heart medication.
Because of the failed test, she and partner Dmitri Soloviev — gold medalists in the team ice dancing event in 2014 at Sochi — won't compete in the world championships this month in Boston.
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Meldonium became a banned substance as of Jan. 1, 2016, in and out of competition and is classified as "hormones and modulators of metabolism.