Final answer:
The ethical concern most directly associated with the practice of implanting identity chips in people is invasion of privacy.
Step-by-step explanation:
The ethical concern most directly associated with the practice of implanting identity chips in people is invasion of privacy. When identity chips are implanted, personal information and activities can be monitored and tracked without consent. This raises serious privacy concerns as individuals may have their movements, behaviors, and even thoughts monitored and controlled without their knowledge or consent, potentially leading to violations of basic human rights.