Drug legalization will enable users to be certain that they are receiving the correct drug. Currently, drugs are often laced with adulterants for various reasons (to aid in trafficking, to increase the effects, etc.). Often, these adulterants are the cause of the primary dangers of use of the drug (as, for example, with Ecstacy). In addition, drug users can not know the purity of such drugs as heroin or cocaine; often overdoses are a result of underestimating the purity. These dangers would be eliminated if drugs were legalized and packages purchased were clearly marked with the purity of the ingredients, as well as a complete list of which ingredients were present.