I have, what I considered, a flawless means of introducing new animals to my tanks, by putting them in a cup with a tiny little hole in it that drips quickly away, and I add small amounts of the aquarium water to it in order to "cleanse" it.
I used this with Rasbora, a molly, and some of my bettas without any problems at all.
Then I tried it with my first ghost shrimp. Needless to say, I had no idea these guys could jump so wildly. Only literally jumped into my kitchen sink garbage disposal. It was one very, very lucky individual to have jumped again, RIGHT out of it and into my hand.
I'm not sure about most shrimp, but ghost shrimp can jump. THe same ghost shrimp somehow jumped out of my aquarium. I have yet to find him, but I've since introduced methods to completely block any of the others from getting out. I suggest you do the same.