Another thing for my wishlist on Disappeared; did the CL notice any of Bob's cleaning supplies had been suddenly depleted, or had disappeared?.....unless she brought her own, that would be very unusual over my way, for a domestic cleaner, but it's yet another thing I need advice on.
In the US, it depends on the tax code and how meticulously it is followed. To greatly oversimplify the question, there are two main categories of employment: employees and independent contractors. The difference is that employees have their various taxes withheld from each paycheck by the employer and independent contractors are responsible for paying their own taxes. With employees, half the FICA (Federal Insurance Contributions Act which funds Social security) comes out of the employee's paycheck and the employer pays half of the FICA. With independent contractors, the independent contractor is responsible for paying the entire FICA. Additionally, employers must pay unemployment tax for each employee.
In most instances, a worker is an employee and the employer has to pay half their FICA. Of course, it hasn't escaped the attention of business people that hiring independent contractors would save the business money, so there are strict conditions that define an independent contractor vs an employee.
As I recall, an independent contractor sets their own schedule, determines how to complete the work they have been assigned and several other factors but the two I listed are the salient ones for Bob and the CL.
One of the things the worked can do to demonstrate clearly that they determine how to complete the work they have been assigned is to take their own cleaning supplies (which includes things like vacuum cleaners and dusters as well as various cleaning formulas).
All of the above is irrelevant, though. The tax laws about employment and compensation are so convoluted that even lawyers don't always understand them and it is workhorse business section story for some reporter to call the IRS a number of different times and record the different answers they are given (out of 10 calls, there's usually 5-7 different answers).
All that really matters is how things were usually done in Bob's house. If the CL usually brought her own cleaning solutions, etc, then she may not have ever noticed what Bob had on hand. If she usually used cleaning solutions provided by Bob, then I'd be curious about how much was left the week before and if significant/unusual amounts of one or more of those solutions was gone the day Bob disappeared.