While the active ingredients are legal in the United States,[not in citation given] the chalk is not legal there. Labeling often falsely claims the chalk is "harmless to human beings and animals" and "safe to use." Chalks have been found to cause serious health problems and deaths. Packaging, often containing lead-based inks, generally does not list ingredients. Despite its illegal status, "Chinese Chalk" is illegally imported from China and sold in corner stores in the United States.
- Fagerlund, Richard (2004-09-04). "Ant chalk could harm people more than ants". Sfgate.com. San Francisco Chronicle. Retrieved 2006-12-09.
- "Building Maintenance - Structural Integrated Pest Management". Dgs.ca.gov. California Department of General Services. Archived from the original on 11 Feb 2007. Retrieved 2006-12-09.
- "Insecticide Chalk". Retrieved 2013-07-10.