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.
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
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).
It's not illegal, but serving in a foreign military or employment with a foreign government in a military role is considered a voluntary forfeiture of US citizenship. Merely taking civilian employment with a foreign government does not jeopardize your citizenship, though you are forbidden from taking an ELECTIVE office in other countries. It has been overlooked at various times (e.g. the Flying Tigers in China, and US volunteers to the RAF/RFC during both WW2 and WW1), but the law is pretty clear on this subject. If you are a dual-citizen of another country, then service in that country's (and ONLY that country's) military is NOT a forfeiture, as you were fulfilling your citizenship's duties to that country. So, if you're a dual Israeli-US citizen, you can serve in the IDF with no problem at all.
Dual Layer is a term for the DVD discs and the PS3 uses Blue Ray Discs that do not need the dual layer to hold many times the information. It was said that the Xbox 360 was not dual layer, but I can not see how it would matter unless a person wanted to try and make illegal copies