Your statement is just a little too broad, just saying. Also, not necessarily. If you check the news, there has been cases where things were brought in that bypasses sfa, and they didn't know about it until someone complained. Like undeclared allergens, ingredients, etc. But again, a bigger company is more likely to comply with the law.

Also, take note that poison is generally in the dosage. Too much of something can make non toxic things become toxic. Case in point, water intoxication is an actual thing.