no dual employment is legal as long as you only work under the maximum hours allowed per week which varys from country to country
no
No they are not illegal.
It will be dealt with by employment legislation. Which section and what those regulations are will depend on which country you are referring to.
An illegal reason to terminate someone's employment is discrimination based on factors such as race, gender, age, religion, disability, or sexual orientation.
Dual citizenship (or dual nationality) is allowed in the UK. Many countries don't accept dual citizenship, so you would have to make specific inquiries.
No, it is perfectly legal.
depends
Yes, it is illegal to discriminate based on age in the United States under the Age Discrimination in Employment Act (ADEA) which protects individuals who are 40 years of age or older from employment discrimination based on age.
No because nicotine is not an illegal substance.
No law requires employers to verify employment, so there is no law to violate.
Seek am employment attorney who will advise you of your rights.
He is Mexican and American (has dual citizenship).