If your child's daycare is spraying the book nook with pesticides, you may have no way of knowing it.

Many California childcare centers are failing to comply with state regulations that require notification of pesticides being used in the facility, researchers at the UC Berkeley School of Public Health have found, according to the San Jose Mercury News. 

In a survey, some 90 percent of daycare centers reported having pest problems with insects like ants, spiders, bees or wasps, according to FOX News. To control the problem, nearly half of them use potentially harmful pesticides, like fogs or sprays. But almost a quarter of those centers surveyed did not notify parents, as required by state law.

By law, parents must receive a list of the pesticides used in the facility and can ask to be notified each time they’re used. While pesticides that are released in the form of a fog or spray are not recommended for childcare centers, they’re not categorically forbidden by state law, either. However, some specific pesticides are expressly forbidden on daycare and school sites. You can see a list of those here.