I am sure the places where you apply probably have a very high turnover rate: retail, mcDonalds and other fast food places. But why would interviews not be necessary, Ruby? An employer needs to make sure they are hiring the right people -- it takes resources within a company and investment to train someone to work in a new establishment. They need to make sure the person will stay with them for more than just a few days and that the investment is worth their money and time. They also need to be sure that the employee has a good track record with other companies and will be professional on the job, doing as they are expected to do, when they're asked and responsible. It's an investment on the company's behalf, just as much as it is on the employee's behalf. The employee, is after all, the face and representative of that company's reputation -- no matter where you work or at what level. So yes, of course interviews are necessary.

And I am sorry you are struggling with getting second interviews. Are they calling your references? You don't have a solid track record or history with employment. This is why it is SO vital and SO critical to be professional on the job, at all times. You have had a very poor track record, and it may be contributing to your difficulties now, I am very sorry to say.