There are many drug test kits on the market, but they are not all the same. Some test kits are meant for testing saliva, urine or hair for traces or drugs. There are also test kits meant to check whether or not marijuana products or the plant itself has certain chemicals. The two main active components in marijuana or weed are; THC and CBD. When buying weed products, you want to know the concentrations of these two compounds. A THC detection kit will help you with this. There are many places where you can buy these kits. All you need to do is search the internet and compare them.
Some vendors usually sell these test kits at competitive rates, but impose a prohibitive shipping fee. Therefore, you have to compare both shipping fees and product prices before you place your order.