i believe they work for some people and not with others

i have been using them for 6 months and have never gotten a true positive..

some times there are 2 lines but never as dark as each other

i think the box just says those warnings as precautions to save their butts incase someone tried to sue them.

but i do agree they work for some and not for others.

you could always try switching brands and then if still nothing consult your doctor. after all, they are the specialists