B.C.
I'm always amazed at the missinformation that people that are supposedly "in the know" pass on to the unsuspecting public.
My brother was a shrimper. If the shrimp is kept cold it will last for a couple of weeks. How do you tell if shrimp has gone bad. It smells bad. Unless you have a bad cold, shrimp that was kept at too high a temperature will smell bad. There will be no doubt in your mind. Its almost like smelling a skunk. Once you smell it you will know. (No. Bad shrimp doesn't smell like a skunk. It has a distinctive smell.)
I keep my shrimp in the freezer and it will keep for a long time, but that depends on what the freezer's temperature is. If its a real good freezer, it will keep your freezer at 5 degrees above Zero or less. If its an old freezer and wearing out, it will keep food frozen at 25 degrees. If your freezer is a "warm" one, wipe all the dust off the pipes and grate. That will make it cool (freeze) better and save you money.
You wil not be poisoned by shrimp that is too old. You may get sick, but you will be able to tell shrimp has gone bad.
BTW, the only dumb question is the one you don't ask. Good luck to you and yours.