24 Summer Intern 什么时候要给公司出示 Work Authorization

如果明年暑假有机会去一家公司做 intern，这个CPT可以算作是我的work authorization吗？
目前面试了几家公司，有sponsor也有不sponsor的。这个 CPT 到底算是需要sponsor吗？我以后不需要他们给我办卡抽签呢？
是不是一般入职第一天才交 proof of work authorization？

CPT come with your school and do not need sponsorship from the company.

Do you need future sponsorship? Yes, if you need H1B, otherwise no
First day to show authorization? Probably not, company need time before your first day to verify CPT. It has to comply with laws or regulations to make sure you are eligible to work