現在想去加拿大簽H1,聽人說第一次簽證隻能回國簽，請問有這個規定嗎？
-It seems only the US Consulate in Mexico has such limit, and I think you still can apply for the H1 visa in Canada. As for the Visa Mantis, your major seems not to be in the Visa Mantis program, see:
http://www.semp.us/publications/biot_reader.php?BiotID=189
For the advance PIMS verification, I don't think you will have this probelm because USCIS has required all employers to provide two copies of the H1 petition materials when they file H1 petition, one is for H1 petition, and another for PIMS. So, your h1 is in the PIMS after your h1 petition is approved. So, not need to worry about that.
