Freon is a gas. If freon is leaking from the unit, there's nothing to see. It is most likely water that is dripping from the unit, which is very common.
It is unlikely that the liquid dripping from you air conditioner is Freon. The cooling coil and the return line to the compressor are colder than the air around them and that will cause water to condense from the air. Freon turns to a gas at room temperature.
There is no need to worry about liquid dripping from any a/c unit. In most cases it is simply condensation. Freon will not drip from the unit, it will turn into a gas as it leaks.
