Sophisticated agentic bots and LLMs like ChatGPT and Claude now complete entire surveys autonomously and generate fake open-ends at scale. Rep Data stops them on two fronts. Our pre-survey fraud prevention blocks automated drivers, virtual machines, LLM device signals, and suspicious user-agents before entry. Our in-survey data cleaning then scores every response for AI language patterns, behavioral biometrics, and coherence to catch anything that slips through. Twelve detection methods across the full survey lifecycle.