The ACLU of Texas reports that it has sent letters to three more school districts — including two in North Texas — demanding that they stop illegally blocking access to LGBT websites on district computers.

The letters were Tuesday to the Hurst-Euless-Bedford ISD; the Northwest ISD, which covers parts of Northern Tarrant, Southwestern Denton and Southeastern Wise counties; and the Aldine ISD near Houston. This brings to five the total number of school districts in Texas that have received letters as part of the ACLU’s “Don’t Filter Me” initiative.

Earlier this month, the Eagle Mountain-Saginaw ISD in Fort Worth and the Goose Creek School District in Baytown agreed to stop blocking LGBT content in response to demand letters from the ACLU. The organization says anti-LGBT filtering programs violate the First Amendment and the federal Equal Access Act.

“We are seeing a pattern across the country in which school districts have enabled anti-LGBT filters without understanding how they work,” said Joshua Block, staff attorney with the ACLU LGBT Project. “Software companies need to make schools understand that these products are programmed specifically to target LGBT-related content that would not otherwise be blocked as inappropriate, and that these types of filters are not required by law. There is no legitimate reason why any public school should be using an anti-LGBT filter.”

Watch the above video to determine whether your district is illegally filtering LGBT content. To report illegal filtering, go here.