It depends completely on the manufacturer or the one who makes the tea. If tea is actually being used with raspberry added, it will depend on the tea itself. If you mean raspberries alone with no actual tea content, there is no caffeine.
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According to the following website, it has 14 mg of caffeine per 8 oz serving. http://www.pepsiproductfacts.com/caffeine.php
Yes, about 40-60 mg. for a tall... compared to a cup of brewed coffee that has about 150-300 for a tall, depending on the roast and brew technique.