In a general view, as the PI operating system (I refer to the standard Debian but also Ubuntu and other distro will work as well) give full access to the USB layer.
Consider that almost all the USB Laser BCD Scanners act as a serial over USB connection with the computer. So there will be not great difficult to manage them by a hardware and connection point of view.
By the other side, the BCD scanners includes a low level hardware control and barcode decoding exposing through the USB-Serial connection the numeric sequence of the scanned code. I suggest you to take a look on what the Chinese producers offer, instead of more expensive producers lilke Spectra Physics and similar. Based on my personal experience, the performances are always almost the same. The most important considerations I think it is the worth to take in account are the following:
Supporting USB to Serial connection is a must (you will found this as a default feature in 95% of the cases)
Well documented connection protocol and data transfer speed
Supporting a well-known communication protocol. Most of the POS (Point Of Sale) related peripherals adopt variants of the most standardised protocol ESC/POS
Ask for the programmer and user manual before doing any choice to be sure that the peripheral will suppor the kind of coding you need (EAN13, EAN15, UPC, Q-Code etc.) and check that you have the control commands that fit your project
Verify that the power supply range of the peripheral is compatible with the USB power from the Raspberry PI (max 500 mA following the USB standard specifications)
Note: in the case that the device is USB-powered but need more than the standard USB 500mA provided by the Raspberry PI ports, consider the option to connect the peripheral to a USB-powered Hub or see if it is possible to power the device separately. The choice depends on the project you have in mind.
