Glad you asked...
To tell is raw shrimp has gone bad you first need to cut the shrimp in half with a knife. Then you need to look at the texture. If the texture looks off or choppy then the shrimp is no good.
Fishinmission     How-To Expert
Then again, this answer might help you...
There are a couple of ways that you can tell that shrimp has gone bad. One is the smell of it. or you might see little white dots on it. Also if it isnt firm.
Jeni2004     How-To Expert
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