Don't touch carfentnanyl with your bare hands under any circumstances. Don't let a speck the size of a grain of salt touch your skin. Jesus christ my dude, there are weaker fent analogues that will do exactly what you're talking about without carrying the massive risk carfent does(10,000x more potent than morphine for those who don't know, for reference heroin is 2.5x more potent than morphine and fentanyl is 100x more potent than morphine). EDIT: even if you  have an opioid antagonist like NALOXONE or NALTREXONE it will NOT work with carfentanyl. Neither one has as high of a binding affinity as carfentanyl. Typically, carfentanyl comes with its own antagonist(think "antitode")...