So apparently on Oahu, Kawaii, and the big island (Hawaii) red eared sliders were established when they grew too large and were released.
While I was at school, my parents found a young one (probably around 4-6 inches long) In our backyard. The poor guy was suffering terribly from the sudden drought, and flipped over onto his (or her) back. The poor guy/gal has two chips in his/her shell and there was some dried blood on the shell unter... IT'S neck. IT (saying he/she is getting annoying) is also not moving around much (we put it in a 18 gallon tub) My parents didn't tihnk of putting in water other than some in a little tiny dish. So I filled a little tupperware thing with just enough water to soak its belly so it doesn't dry out (plus it might drowned in its weakend state with any more water)
My parents are considering keeping it. If we do get to, We will probably have to buy another 55gallon tank or something (I haven't researched yet but I will in a minute) Hawaii is not kind to semi aquatic turtles.