That's a common misunderstanding. If you learn of a trade secret through improper means, you can be liable federally under the DTSA or similar state statutes like CUTSA in California.

These were the statutes cited in the Anthony Levandowski lawsuit 9yrs back, where Uber settled for a 0.34% equity stake in their company.

Completely incorrect:

https://en.wikipedia.org/wiki/Trade_secret#United_States

Trade secrets are protected by civil (https://www.law.cornell.edu/uscode/text/18/1836) and criminal law (https://www.law.cornell.edu/uscode/text/18/1832). There's a history of enforcement actions under both.