Jpeg preview images -- how to check

Whenever I take my USB stick to a photolab to print images, if I don't save from Photoshop with "Image Previews" turned off (and most of the time I forget to turn it off), the dopy photolab machine recognises the previews as separate images and presents them as printable images (which they are not – they will print heavily pixellated).
Is there any way of checking in the Finder whether an image has a preview embedded – the kind that a photolab recognises – and be able to remove the preview if there is one? Or is this a Photoshop thing?
Note: this preview image I'm talking about does not appear to be the same preview as the Finder uses. Images saved from Photoshop with Image Previews turned on or off (Preferences > File Handling > File Saving Options > Image Previews > Never Save/Always Save), both have previews on the Desktop.

Thanks for the responses.
Kurt
"It's not clear what you're referring to when you say a Finder preview image; are you referring to QuickLook, which is a feature of Snow Leopard?"
I was not aware of QuickLook. The preview images are the ones that Finder shows you in "icon" format.
Fane_J
I'm using Photoshop CS4.
"…and another file containing the resource fork, with the same name and the prefix "._". This file is invisible…"
That's the one! I get two of every image and one of them has the underscore. The Fuji Lab warns you that it will not print properly, but it will allow you to print them. It has happened several times when friends want me to edit their images and I save them to their USB sticks – but forget to turn off preview. They get back to me complaining about the quality of the images when they choose the wrong one.
The Fuji Lab I am talking about is like this one: http://www.livingroom.org.au/photolog/images/fujifilm_DPC.jpg
The Fuji Lab also recognises every image in the trash. So if you have 500 images in the trash, and want to print only one image, you'll get 501 images to select from. What I mess.
I suspect it has something to do with the way PCs and the Fuji Lab interpret images, as a friend who uses a Mac to save Photoshop images onto a USB stick, and then takes them to the local camera club for projection, also complained to me (I was the one who suggested he use a USB stick) that the PC used for projection was picking up everything in the trash. He wanted to project half a dozen images, but several hundred came up.
Problem does not seem to occur if I burn to CD and use the CD to print or project images.
So the situation is: if I save images (preview on) from Photoshop onto a USB stick, the Fuji Labs recognise two images for each image, one of which has an underscore. All images in the trash are also recognised. Same seems to apply when read by a PC.
What does saving a preview image in Photoshop do anyway? Is it necessary? Maybe I should just turn off "Save Preview" and leave it off.
You mentioned FAT32. If I reformatted the USB stick to a different format, would that fix the problem?

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