[qwertox]

"How could I know this is illegal, if it was sold on Amazon and had great reviews?"

[imchillyb]

The same way you would know that flying a drone, today, without a license is illegal in the USA.

We are required, in our society, to keep ourselves informed. Ignorance is no excuse for breaking laws in the US.

[nkrisc]

If that’s your defense in court, good luck.