There are many job scams on Craigslist and among the most common are credit report scams.
A scam occurs when an "employer" asks to see your credit report. The employer requests that you use a specific "free" service that ends up costing you money. However, the employer isn't a legitimate employer and you may end up paying for a credit report.
Here's more on credit report scams, including examples of scam email messages and what to do if you have been scammed.
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