In the legal profession and courts, a querulant  (from the Latin querulus - "complaining") is a person who obsessively feels wronged, particularly about minor causes of action. In particular the term is used for those who repeatedly petition authorities or pursue legal actions based on manifestly unfounded grounds. These applications include in particular complaints about petty offenses. Querulant behavior is to be distinguished from either the obsessive pursuit of justice regarding major injustices, or the proportionate, reasonable, pursuit of justice regarding minor grievances. According to Mullen and Lester, the life of the querulant individual becomes consumed by their personal pursuit of justice in relation to minor grievances. Use in psychiatry
In psychiatry, the terms querulous paranoia (Kraepelin, 1904) and litigious paranoia have been used to describe a paranoid condition which manifested itself in querulant behavior. The concept had, until 2004, disappeared from the psychiatric literature; largely because it had been misused to stigmatise the behavior of people seeking the resolution of valid grievances. It also appears in ICD-10, under its Latin name Paranoia querulans, in section F22.8, "Other persistent delusional disorders". Frequency
According to Lester et al. querulous behavior remains common, as shown in petitions to the courts and complaints organizations. They state that "persistent complainants’ pursuit of vindication and retribution fits badly with complaints systems established to deliver reparation and compensation [and that these] complainants damaged the financial and social fabric of their own lives and frightened those dealing with their claims." See also
Idée fixe
Monomania
Persecutory delusion
Vexatious litigation

References
External links

Blaney, Paul H.; Millon, Theodore (20 November 2008).
One example is the Friedel–Crafts alkylation of benzene by allyl chloride to yield beta chloropropylbenzene which is then reacted with ammonia to produce racemic amphetamine (method 2). Another example employs the Ritter reaction (method 3). In this route, allylbenzene is reacted acetonitrile in sulfuric acid to yield an organosulfate which in turn is treated with sodium hydroxide to give amphetamine via an acetamide intermediate. A third route starts with ethyl 3-oxobutanoate which through a double alkylation with methyl iodide followed by benzyl chloride can be converted into 2-methyl-3-phenyl-propanoic acid. This synthetic intermediate can be transformed into amphetamine using either a Hofmann or Curtius rearrangement (method 4).A significant number of amphetamine syntheses feature a reduction of a nitro, imine, oxime, or other nitrogen-containing functional groups. In one such example, a Knoevenagel condensation of benzaldehyde with nitroethane yields phenyl-2-nitropropene. The double bond and nitro group of this intermediate is reduced using either catalytic hydrogenation or by treatment with lithium aluminium hydride (method 5). Another method is the reaction of phenylacetone with ammonia, producing an imine intermediate that is reduced to the primary amine using hydrogen over a palladium catalyst or lithium aluminum hydride (method 6). Detection in body fluids
Amphetamine is frequently measured in urine or blood as part of a drug test for sports, employment, poisoning diagnostics, and forensics. Techniques such as immunoassay, which is the most common form of amphetamine test, may cross-react with a number of sympathomimetic drugs. Chromatographic methods specific for amphetamine are employed to prevent false positive results.