A detective said at Old Street, London, yesterday that he understood that in certain cafes in the area Òpurple heartÓ tablets Ñ a stimulant drug Ñ were eaten like sweets. Carmelo Brincat (22), counter hand, of Cross Street, Islington, was fined £5 on pleading guilty to possessing 90 Òpurple heartÓ tablets, suspected to be stolen or unlawfully obtained. Detective Peter Goodall said the source of the tablets had not been traced. ÒPurple heartÓ or drinamyl tablets, were a stimulant drug and habit-forming. The medical dose should never exceed one tablet three times a day. It was understood that Brincat had been taking the tablets, but there was no reason to suppose he was a pedlar or marketeer.