If you are a smart consumer, you realize that the only thing that counts to many marketers is the sale. Their web sites, product labels, guarantees and promises are all designed to close the deal and sell you their product.  Even if you know all this, you can easily be swayed. For example:

Surfing for solutions to your drug test, you come across a website with a black background. There are pictures of models in lab coats looking at reports or holding beakers of colorful liquid. This is all meant to give you and impression of reliability.

The products are expensive, but they promise everything you need. "Maybe it's worth it" you think. Maybe you should even buy the pills to "supplement you cleaning program", even though you should not need it based on their fantastic claims.

To top it off there is a gold seal claiming they were voted most effective. You see the exact same seal on many other web pages all with different company names, graphics, and backgrounds. At first you think that the voted most effective seal is just a sham that many different companies are using to give you a sense of security. After all, they can't all be voted most effective!

On further investigation, you see the same phone number listed on all these web sites. You realize that what appeared to be a dozen different companies marketing the same old flavored drink mixes, is really just one company trying to give you the illusion of choice. 

Looking at the order pages, you see over-priced shipping rates and a disclaimer saying "We do not refund shipping charges." Their web site also markets other rip-off products such as magical diet pills, and an easy way to quit smoking tobacco. Perhaps they will sell you the "secret" to making a six figure income!

Then you discover that they are working both sides against the middle by offering "Drug Testing Services." Just send in a cup full of urine, and they will mail back your results. 

Always be critical when someone is trying to sell you something. You may not find all of these example indicators in one website. Even if you see a few indicators you may feel safe ordering from a company. The point is to be alert.