spike

The Japan Times Online Jan.10の記事から引用します。
One of Japan’s top sprint canoeists banned for spiking rival’s drink to cause positive drug test
One of the country’s top sprint canoeists has been banned from competition for eight years for spiking a younger rival’s drink with an anabolic steroid, causing him to fail a doping test, the Japan Anti-Doping Agency said Tuesday.
この事件は正月の休み明けに大きく報道されたので、この意味の "spiking" は知りませんでしたが、ここでは飲み物に何か違法のドラグを混ぜた意味になることであることは分かりました。一応辞書で確認します。
・Oxford English Dictionary: Add alcohol or a drug to contaminate (drink or food) surreptitiously.: ‘she bought me an orange juice and spiked it with vodka’
・Collins Dictionary: If your drink is spiked, someone has added alcohol or drugs to it without telling you.: They wondered whether their drinks had been spiked.
・Cambridge English Dictionary: to make a drink stronger by adding alcohol, or to add flavour or interest to something: She claimed that someone had spiked her drink with whisky.