In 2009, a group of US state attorneys general began active investigations of companies which produced and sold caffeinated alcohol beverages, on the grounds that they were being inappropriately marketed to a teenage audience and that they had possible health risks (blackouts). The attorneys general were also concerned that these drinks could pose health risks by masking feelings of intoxication. In December 2008, Anheuser-Busch, manufacturer of Tilt and Bud Extra, as well as MillerCoors, manufacturer of Sparks, agreed to reformulate their drinks. In 2009, smaller companies such as Phusion fell under investigation because of their rise in market share.