No, legally, you cannot have someone else place a bet for you in a casino in Las Vegas or anywhere else in the United States. All betting in casinos is required to be conducted by the individual who is legally responsible for the wager. This is to ensure that the person placing the bet is of legal gambling age and is making the decision to gamble of their own free will.
If you are unable to place a bet yourself due to being underage, being excluded from gambling, or any other legal restrictions, you are not permitted to have someone else act as a proxy for you. Casinos have strict rules and regulations that they must follow, and they are closely monitored by gaming commissions to ensure compliance.
If you are of legal gambling age and wish to place a bet, you must do so in person at the casino. Remember to gamble responsibly and within your means.
