Naturally, I support these laws as they help create a culture that is more open about self-directed death. But if you don't have them or can't use them, you can still help your PALS exercise the human right acknowledged in most creeds, to avoid unnecessary suffering.
The number of PALS that have a "dignified death" [defined as not suffering or a life longer than what they wish] goes way past living in states or countries with applicable laws or receiving hospice services.
Death on your own terms requires only one doc or other clinician (NP, PA, depends on where you are) willing to prescribe morphine for "air hunger" and a CALS or other person willing to administer it as per the PALS' wishes, followed by removing the BiPAP mask when the person is at peace. It doesn't require dosing some pre-measured cocktail.
Thus, "death with dignity" is simply a "don't ask/don't tell" occurrence in most of the world. Karen is right to suggest that your state or region-specific advance directive be in place, if you are in a country that recognizes those. But advance directives don't replace discretion, even where DwD laws exist, because as Karen also points out, the exact provisions aren't geared for ALS.
CALS learn that they have to do what they know is right. Often, due to circumstances and PALS' preferences, CALS' responsibility extends to the time and manner of death. The loss is still agonizing, but the path to action itself should not be, if P/CALS have discussed all this beforehand.
Best,
Laurie