Yes, federal law enforcement agencies should avoid using younger informants in drug cases because of safety concerns. In many cases, agents pressure young people into serving as informants when they have been picked up for very minor offenses. The agents use fear to coerce them into working as informants of dangerous cartels, and the practice should be prohibited.
Due to the violent nature of the drug trafficking world, young student informants are too much at risk to be used by federal agencies. The immature naive nature of young people means that they are not prepared for the high stakes of the drug world. It would be better to de-criminalize some of the minor drug crimes.
Children should not have their lives put at risk by the Federal government to gather evidence. The government should have to find alternative means to gather evidence for use against potential criminals. Jeopardizing the lives of children for the sake of prosecution is unethical, and will lead to ill-will against the government and police in the long run.
Unfortunately, as long as drugs are being sold to and by students the need for young informants will continue. These young informants are aware of the risks of the situation they are in. In many cases being an informant helps them to get out of an even riskier situation. While tragic, this is not an epidemic.