( CNN ) -- A California woman who police say planted two bottles of tainted orange juice at a San Jose Starbucks has been charged with attempted murder , a police spokesman said Tuesday . Ramineh Behbehanian , 50 , is accused of adding rubbing alcohol to the contents of the bottles and then placing them into a refrigerated display case , Police Sgt . Jason Dwyer told reporters . `` According to our San Jose firefighters that were on scene and the fire captain there -- they really are the experts there -- it was a lethal dose , '' he said . Behbehanian was arrested Monday after a customer spotted her allegedly pulling out two bottles of orange juice from a bag and putting them in the display case , he said . The customer reported it to employees , according to police . The customer also got a license plate number , and investigators later traced the plate to Behbehanian 's residence , Starbucks spokesman Zack Hutson said . The employees immediately pulled the bottles of orange juice from the display case , and the store was evacuated until firefighters could determine the contents of the bottles , Hutson said . The store employees pulled all the remaining juices from the cold case and destroyed them , he said . Nearby Starbucks stores were also notified of the incident and told to check the juice bottles . Hutson said the coffee chain was `` immensely grateful '' to the customer who alerted employees to the tainted juice bottles . Dwyer would not comment on the evidence in the case nor a possible motive , saying authorities were `` still very much in investigative mode . '' He did say the bottles were opened rather than injected by a syringe . CNN 's Janet DiGiacomo contributed to this report .
NEW : A customer spotted the couple cleaning out the bottles , Starbucks says . Ramineh Behbehanian , 50 , has been charged with attempted murder , police say . She is accused of poisoning two bottles of orange juice with rubbing alcohol . ` ` It was a lethal dose , '' a police spokesman says .