Non-detection in Research Lab
If you are going for a non-detection/no-kills game, I found a helpful hint to take down the FROGS in Naomi's jungle research lab without being noticed. Its really heroic and brave too. Simply hide under the bed and wait for them to walk past and shoot them with whatever lethal/non-lethal weapon you want, they wont be able to see you, and actually stand still, making them easier to shoot.