For those that think an unwarranted search is okay because "they have nothing to hide", keep in mind that some legitimate things you might do can trigger consequences in the mind of the LEO.
I'm thinking of those who have had their cash impounded because it looked like they were carrying too much. When in fact they were Canadians, heading south for the winter, and took their money in currency, several thousand dollars worth. Maybe that's not wise, but they didn't deserve to have it confiscated, then have to aergue with the courts (unsuccessfully) to get it returned.
So for me, like other police officers posting here, it's "no, I don't consent to a search". If they do it anyway, we have a situation for the courts -- nothing I can do at the time.