All switchblades, whether OTF or not, are illegal to possess in Virginia.
https://law.lis.virginia.gov/vacode/title18.2/chapter7/section18.2-311/
The law is phrased oddly, in that it prohibits sale of switchblades, but then says
mere possession is grounds for the court to automatically assume sale was intended.
(and note some OTF knives are not switchblades, like the Boker Slyde-R)