It's illegal in some countries to use "organic" on the label unless a particular code of practice is followed. This standard of practice is enforced in the US, EU, Japan, and other countries. Keep in mind that all countries do not adapt this practice. Negligence, corruption, lack of resources, naivety, and perhaps other reasons, allow unrepresentative labelling to occur to this day. With tighter controls on food importing, we can attempt to ensure that most improperly labelled foods do not find their way into our food chain. However, we can never detect "all" the products. This is why a little knowledge goes a long way.
How do we know what we are buying? There are certain things to look for when selecting any food. First of all, keep in mind that "all foods are organic anyway, in the chemical sense of the word"- all foods contain carbon. Most molecules contain a carbon skeleton. If you look at the section on carbohydrates, you can see some sample molecules with a carbon skeleton. Thus, organic in this way, does not imply "healthy", but rather tells us that there is carbon in the food. That's a bit of useless information.
The best strategy for understanding what you're consuming is to read and understand the ingredients. Why? Because by understanding the ingredients, you know exactly what is used in the manufacture of what you're consuming. And this supercedes any marketing term printed on a label.