Step1
Sight: Look at the meat in the counter, or in your refrigerator. Except for beef, (in some instances which I'll describe below), meat that is turning green, or has mold growing on it is unfit to eat. With packaged chicken and fish you can somewhat tell the age by how much "water" is in the package. Fresh chicken and fish will have very little fluid in the package. As days in the package increase, so does the fluid, and the bacteria count.
Step2
Smell: Don’t eat any meat it if it smells bad! It’s hard to believe people have to be told not to eat something that smells bad, but many of us have been raised to not trust our senses as children, and eat what’s placed before us – or else! Fresh fish won't smell fishy!
Step3
Feel: In some instances touch can tip you off that something isn’t right with your meat. This is especially true with chicken and fish. If your nose is stopped up and you can’t smell there is something wrong with the chicken you bought 4 days ago, the slimy feel of the meat should make you question its “safe for consumption” quotient. Normal fresh chicken feels like it is wet with water, and there should be some friction when you rub the fluid substance between your fingers. Slimy chicken feels, well, slimy. If you rub your fingers together there will be no friction.
Step4
Taste: If you bite into "bad" meat, (meat that tastes bad), Spit It Out! Don’t worry about what people around you think! (Okay, if you have impeccable manners, and are more concerned about those around you than your own health, “tastefully” spit out the meat into your napkin. Just remember, every second the bad meat is in your mouth, you are letting many more toxic bacteria into your system.)
Step5
Listen: I'm hard pressed to think of an instance when your hearing will help you ascertain whether "fresh" meat in your refrigerator is still fit to eat. But here's one instance when that might happen: If you find a "from the meat market" plastic-wrapped package of meat in the back of your fridge that is swollen like a balloon and it makes a sound like a deflating balloon when you puncture it, (this would most surely be followed by a horrible smell), don't eat it! I can only imagine this being a helpful hint for someone who has a cold and can't smell, or see, because meat found in a package in that condition would surely be hideous to look at or smell.
Step6
Big Tip: If you want to have really good hamburger meat, with great flavor, (and little risk of contamination by e-coli), pick a nice steak out of the meat counter, and ask the meat cutter to grind it personally for you. (I prefer Sirloin steak. It's lean, but has just enough fat to make it tender and full of flavor.)