An ingredient in weedkiller has been detected in a bottle of green tea sold at a Tokyo supermarket, and police and its manufacturer suspect the substance was deliberately mixed into the bottle, officials said Saturday. The incident involved a bottle of Healthya, a hit product made by Tokyo-based Kao Corp. touted as dissolving fat. A 43-year-old man in Nerima Ward who suffered minor diarrhea after drinking the tea told police the cap on the bottle appeared to be loose when he opened it.