Most low wage jobs in the US have a mandatory drug test when you're hired, which is easy enough to defeat. The only things that don't leave your system after a couple days are all the mild things like weed.

I've had several retail and service jobs where I had to drug test before getting hired and just took a "cleaner" from a headshop before doing them and passed each time despite using the devils lettuce in my off time, but none of these were places that do random testing after being hired. Being able to be choosy with jobs is somewhat of a luxury in the US, so consider yourself fortunate.

A delivery job is a tossup because it may be more heavily regulated than jobs that don't involve heavy machinery. If it's a delivery job that requires a CDL, I would skip it because you can be pulled over and tested at any time. Even marijuana can be penalized here since these jobs are covered by federal regulations and national insurance companies which have requirements for a drug free workplace.