Lead was a common building material that was widely used until the 1970s when certain critical health factors came to light. Lead is a naturally occurring element found in the ground and has been used worldwide for nearly 6000 years. Poisoning from this material has been relatively common throughout history, but it took decades of activism and health studies to ban lead in 1978.

The topic of heavy metals in household items has many individuals concerned for their safety. In order to understand the health effects of heavy metals, we first have to understand what that means. Metals in the environment are naturally occurring, and humans and animals have been exposed to some level of metals in their homes, food, and water, for a long time.

Forensics is a broad word, encompassing a variety of scientific subjects culminating in providing clear and specific evidence for a singular purpose. Environmental forensics allows scientists to test various areas for contamination and has a history going back hundreds of years. Even before microscopes, the educated crime fighters of the day still gathered soil and water samples in an attempt to analyze them and solve cases. While the testing methods were crude and hardly accurate, humans understood that the soil, air, and water held numerous organisms that could help or hurt us. 

Legionella is a commonly found bacteria in lakes, rivers, and ponds at low levels. This bacteria needs water to flourish, but it is relatively harmless when contained in a natural body of water. However, sometimes legionella bacteria makes its way into stagnant water systems, like water cooling systems, fountains, and hot tubs. When it does, it can potentially infect humans and cause Legionnaires disease. This serious respiratory illness may be fatal, especially to those over 50 years of age or otherwise immunocompromised.