axel giovany casseus, alleging he supplied drugs to the students. police believe it was cocaine laced with fentanyl. >> has one male adult that did code. we believe this was an incident cocaine laced with fentanyl. >> reporter: first responders rushing to save seven spring breakers, one by one, treating them right on the front lawn of their vacation rental. several in cardiac arrest. >> we were able to get some of those individuals back so their heart was beating again with the narcan. >> reporter: officials say at least four west point cadets are among the victims. the drug so powerful that police say two people were exposed to it while performing life-saving cpr and also had to be hospitalized. tonight, officials warning incidents like this happening more often. >> it's not that there are more people doing drugs today, but it's much more dangerous to do drugs, and that's because of fentanyl. >> reporter: and, whit, tonight, at least two victims are still in the hospital. the fort lauderdale fire chief