Whetstone, Arizona Roadblocks

Border patrol officers. All cars are forced into checkpoint. all cars are stopped and inspected. They visually search your vehicle through your windows before speaking to you. Then, they ask your citizenship. I asked if i was free to go, they said no. I asked if i was being detained, they said no. Tried to move me to secondary area. Said it sounded like i’m being detained, am i free to go? Etc.