There are literally dozens of areas that can be attacked, all of which require technical knowledge of the law. I would recommend going counsel to review what, if any, arguments you may have in your situation.
Your financial resources affect your potential options. If you can afford to hire private counsel you will likely maximize your opportunity to invalidate the blood test that evidenced meth in your system.
Saying no, even respectfully, can be deemed a refusal. As the others have stated, it results in a one year suspension of your license and some additional penalties in criminal court.
Don't lose all hope yet though, because the refusal can be opposed through and APS hearing with the DMV. The request needs to be filed within 10 days of arrest. Make sure you hire an attorney who has a team of people who are extremely familiar with the DMV, as well as fighting refusal cases.
The law allows you to request an exemption from IID installation. The Exemption for Ignition Interlock Device (IID) (DL 4055B) form is included as an insert with all DUI suspension or revocation notices mailed to offenders in the pilot counties. The form must be submitted to a DMV field office or mailed to the Driver Licensing Mandatory Actions Unit (DLMAU) within 30 days of the suspension or revocation notice mail date.
I'm assuming the arrest was in CO because you mention an automatic suspension as part of the penalties. If that is the case, the bottom line is that your suspension in CO should have resulted in a suspension here in CA because the two states share reciprocity. However, lets just say the lines of communication have been strangled the past few years by the lack of finances in the government.
I have several clients who have had similar results after such an out of state suspension.
Generally speaking, I have seen only limited acts of deportation for DUI related offenses. I recommend a consultation with an Immigration Attorney immediately so that you can understand what type of result you need in the DUI matter to avoid any and all immigration issues.
However, it is likely an immigration attorney simply tells you that you would be much better off without a DUI than with one. Keeping this in mind, fighting the DUI charge, and doing everything within your resources to...
I would contact the court clerk to check if you have any dates calendared, or what the court is viewing as the "status" of your case. Another option is to contact the District Attorneys office, and ask a few questions relating to your matter and its future dates. You mention 'dismissed', but it wouldn't hurt to follow up and confirm.