dogs sense of smell

Question
what if the person who owns the drugs are allergic to dogs and the dogs get near him/her and then he/she gets this huge allergic reaction. what do you think will happen next?
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The text above is a follow-up to ...

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this is for a school project and can dogs get an overdose or something when they smell too much of drugs?
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The text above is a follow-up to ...

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should dogs that are able to smell drugs be allowed on school?
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You REALLY don't want me to answer this, since the '93 on your webname could be your year of birth, but since you asked....

Yes.

Why not?

If there are no drugs there, then the dogs will find nothing and parents will be happy....

I'm not sure where you live, but where I live, the schools have metal detectors at all entryways, and armed guards patrolling the hallways. Dogs are not as intimidating.

You know, you DID ask.
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(Sorry about the flip answer before; we have issues of drug problems in our local middle and high schools - we live near the Tx/Mx border)

No, they cannot get overdosed, unless, I assume, they accidentally break a bag or something like that.  

Drug sniffing dogs are specially trained to search for drugs, sometimes other contraband (ammo, for instance, explosives, other nasty stuff), and even people. As I understand it from colleagues of mine (I work for the federal government as a Biologist, and some co-workers are in the Law Enforcement area dealing with the smuggling of animals and animal parts into the US), dogs from any breed or no breed can be trained, providing they have 'the nose'. As I was told by a friend in Border Patrol, most of these dogs are shelter rescues, which is why no two also look alike.

When they get a 'Hit", or find something, the dog either gives its handler a signal, like sitting down, or barking until the handler comes over.  The more the dog finds, the more the signal the dog gives. These dogs are not guard dogs, or security dogs. APHIS, a division of the USDA, trains beagles to wander with their handlers at airports to sniff out contraband plants and drugs, and most police departments have at least one dog that can be brought to schools to show children how they work.

Your initial question was whether or not these dogs should be allowed in school, and I answered yes because they are trained to sniff out drugs only. That's it. Though I'm not a parent, the schools near my home NEED these dogs. The children are not bad, just the few that bring in drugs, then the guns (because some of the schools have gangs). The dogs give the children a sense of safety. Unless specified in local laws, these dogs are also allowed legally to be in schools, too.

I hope this answer helped. If you need more, I can perhaps lead you to some websites that show how these dogs are chosen, trained, and where and how they work.  

Answer
He/She would have to do some explaining as to WHY the dog is singling him/her out.

Besides, allergic reactions tend to be caused by dander (similar to dandruff) and trained dogs tend to be groomed daily by their handlers to minimize said allergic reactions.

Your questions ran from if it's legal to have drug-sniffing dogs in schools, to if a drug-sniffing dog can OD, now to allergic reactions of the drug-carting allergic-to-dog person....