Most of the people who say the strips didn't work have a real big unenclosed room and/or lots of ventilation. Did you follow the directions, then double the amount? Did you turn off /down your fans for a few days? The rest of the people that say they didn't work failed to buy the correct product. Are you using No-Pest Strips made by Spectracide? Actually I think there is another brand that works now. Scratch that. Are you using a yellow thing about 10 inches long, with an active ingredient called Dichlorvos? That's what you need to be looking for - it's some dangerous nasty stuff.